add development notes to README

README.md

@@ -14,3 +14,16 @@ code is licensed under the Apache License 2.0
 - `Foxchat.Core`: shared classes and model definitions
 - `Foxchat.Identity`: identity server
 - `Foxchat.Chat`: chat server
+
+## Development
+
+- You need [.NET 8][net8] to build Foxchat.
+- You also need the [EF Core tools][efcoretools]: `dotnet tool install --global dotnet-ef`
+- During early development the configuration files are checked into Git,
+  once the software is closer to usable they will be removed and replaced with example files.
+- Both servers (Foxchat.Chat and Foxchat.Identity) should be run from their respective directories with `dotnet run`.
+- The database can currently be migrated with `dotnet ef database update`, built-in migration will be added later.
+- New migrations can be created with `dotnet ef migrations add <name>`.
+
+[net8]: https://dotnet.microsoft.com/en-us/download
+[efcoretools]: https://learn.microsoft.com/en-us/ef/core/cli/dotnet