Add initial README with project overview and links

README.md

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+# Welcome the Railengine examples repository
+
+## Getting started
+
+1. Sign up for a free account at [Railengine](https://railengine.ai)
+2. Choose your stack or use case from below
+
+### Apps/Agents
+
+[.NET](https://github.com/RailtownAI/railengine-examples/tree/main/CSharp)
+
+[TypeScript](https://github.com/RailtownAI/railengine-examples/tree/main/TypeScript)
+
+[Python](https://github.com/RailtownAI/railengine-examples/tree/main/Python)
+
+### AIoT
+
+[Arduino](https://github.com/RailtownAI/railengine-ingest-arduino-sdk/tree/main)
+
+[Embedded Swift](https://github.com/RailtownAI/railengine-ingest-embedded-swift-sdk)
+
+[MicroPython](https://github.com/RailtownAI/railengine-examples/tree/main/MicroPython)
+
+[.NET nanoFramework](https://github.com/RailtownAI/railengine-examples/tree/main/nanoframework)
+
+### Use cases
+
+[Metrics/Status Page](https://github.com/RailtownAI/railengine-examples/tree/main/CSharp/Examples/RailenginePoweredStatusPage)
+
+[Expense Tracker](https://github.com/RailtownAI/railengine-examples/tree/main/TypeScript/nextjs-expense-tracker)
+
+[Food Diary](https://github.com/RailtownAI/railengine-examples/tree/main/TypeScript/nextjs-food-diary)
+
+[Thermometer](https://github.com/RailtownAI/railengine-examples/tree/main/MicroPython)