update readme, add contribution guide, add license (#9)

Author: alexrashed

CONTRIBUTING.md

@@ -0,0 +1,51 @@
+# Contributing
+
+## Manual Build
+### python3-dev
+You need Python developer version libraries in your path to be able to build the distribution.
+For most of us who use pyenv, this is done with:
+- MacOS:
+  ```bash
+  env PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install 3.10-dev
+  ```
+- Linux:
+  ```bash
+  env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 3.10-dev
+  ```
+
+Activate the version:
+```
+pyenv local 3.10-dev
+python --version
+```
+This should print something like `Python 3.10.11+`.
+
+### Building
+You can build the specific versions by calling the respective make target:
+```bash
+make clean dist-bin/localstack
+# or:
+make clean dist-dir/localstack
+# or both:
+make clean all
+```
+You can find the binary assets in `dist-bin/` and `dist-dir`.
+The single binary has a slower startup time than the binary distribution.
+
+## Creating a Release
+In order to create a release, just perform the following tasks:
+- Create a commit which sets a new explicit version for `localstack` in the `requirements.txt`.
+  - For example: `localstack==2.1.0`
+- Create a tag for the commit: `v<version>`.
+  - For example: `git tag v2.1.0`
+- Push the tag (`git push origin v<version>`)
+- This will trigger the following actions:
+  - The tag will trigger the ["Build / Release"](.github/workflows/build.yml) GitHub workflow.
+  - It will build the binaries for the different systems and create a GitHub release draft.
+- Publish the GitHub release draft.
+- This will trigger the ["Release Homebrew Tap"](.github/workflows/homebrew.yml) GitHub workflow.
+  - It will take the release artifacts and update the Homebrew formula in [localstack/homebrew-tap](https://github.com/localstack/homebrew-tap).
+
+### Dev Releases
+If a dev release is created, the tag name has to have the same name as the version of `localstack-core` being used (because this is the output of `localstack --version`).
+Otherwise, the ["Release Homebrew Tap"](.github/workflows/homebrew.yml) GitHub workflow will not be able to find the artifacts.

LICENSE.txt

@@ -0,0 +1,14 @@
+Copyright (c) 2017+ LocalStack contributors
+Copyright (c) 2016 Atlassian Pty Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

README.md

@@ -5,52 +5,17 @@ This repository contains building instructions for binary builds of the LocalSta
 It does not contain the actual source for the CLI, since the LocalStack CLI is basically just the Python package `localstack` (published on PyPi) with it's install dependencies (and without any extras).
 This is why this repository just contains the build config and pipeline that packages the LocalStack CLI python package into a standalone binary using PyInstaller.
 
-## Creating a Release
-In order to create a release, just perform the following tasks:
-- Create a commit which sets a new explicit version for `localstack` in the `requirements.txt`.
-  - For example: `localstack==2.1.0`
-- Create a tag for the commit: `v<version>`.
-  - For example: `git tag v2.1.0`
-- Push the tag (`git push origin v<version>`)
-- This will trigger the following actions:
-  - The tag will trigger the ["Build / Release"](.github/workflows/build.yml) GitHub workflow.
-  - It will build the binaries for the different systems and create a GitHub release draft.
-- Publish the GitHub release draft.
-- This will trigger the ["Release Homebrew Tap"](.github/workflows/homebrew.yml) GitHub workflow.
-  - It will take the release artifacts and update the Homebrew formula in [localstack/homebrew-tap](https://github.com/localstack/homebrew-tap).
+## Installation
+Please make sure that you have a working [`docker` environment](https://docs.docker.com/get-docker/) on your machine before moving on.
 
-### Dev Releases
-If a dev release is created, the tag name has to have the same name as the version of `localstack-core` being used (because this is the output of `localstack --version`).
-Otherwise, the ["Release Homebrew Tap"](.github/workflows/homebrew.yml) GitHub workflow will not be able to find the artifacts.
-
-## Manual Build
-### python3-dev
-You need Python developer version libraries in your path to be able to build the distribution.
-For most of us who use pyenv, this is done with:
-- MacOS:
-  ```bash
-  env PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install 3.10-dev
-  ```
-- Linux:
-  ```bash
-  env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 3.10-dev
-  ```
-
-Activate the version:
+### Brew (MacOS or Linux with Homebrew)
+Install the LocalStack CLI by using our [official LocalStack Brew Tap](https://github.com/localstack/homebrew-tap):
 ```
-pyenv local 3.10-dev
-python --version
+$ brew install localstack/tap/localstack-cli
 ```
-This should print something like `Python 3.10.11+`.
 
-### Building
-You can build the specific versions by calling the respective make target:
-```bash
-make clean dist-bin/localstack
-# or:
-make clean dist-dir/localstack
-# or both:
-make clean all
-```
-You can find the binary assets in `dist-bin/` and `dist-dir`.
-The single binary has a slower startup time than the binary distribution.
+### Binary download (MacOS, Linux, Windows)
+If you do not have Brew on your machine, you can directly download the pre-built LocalStack CLI binary for your system:
+- [Download the latest release for your platform](https://github.com/localstack/localstack-cli/releases/latest)
+- Extract the archive to a folder in your `PATH` variable:
+  - MacOS / Linux: ```sudo tar xvzf ~/Downloads/localstack-cli-*-darwin-*-onefile.tar.gz -C /usr/local/bin```