feat: Add initial implementation of CI/CD workflows, documentation, and testing framework

docs/articles/getting-started.md

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+# Getting Started
+
+## Prerequisites
+
+- [.NET 10 SDK](https://dotnet.microsoft.com/download)
+
+## Run the Server
+
+```bash
+dotnet run --project src/EchoHub.Server
+```
+
+On first run, the server automatically:
+
+1. Creates `appsettings.json` from the example config
+2. Generates a secure JWT secret
+3. Creates the SQLite database with a `#general` channel
+
+## Run the Client
+
+```bash
+dotnet run --project src/EchoHub.Client
+```
+
+Connect to a server, register an account, and start chatting.
+
+## Build from Source
+
+```bash
+dotnet build src/EchoHub.slnx
+```