Initial STEP 3 study game and questions API

README.md

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+# STEP 3 Arcade
+
+Godot study game with a bundled ASP.NET Core Questions API.
+
+## Local API
+
+Run the Questions API:
+
+```powershell
+dotnet run --project api/QuestionsApi/QuestionsApi.csproj
+```
+
+For deployed environments, set these as environment variables:
+
+```text
+MongoDB__ConnectionString
+MongoDB__DatabaseName
+Jwt__Key
+Jwt__Issuer
+Jwt__Audience
+```
+
+Default local endpoint:
+
+```text
+http://localhost:5008/api/questions/search
+```
+
+The Godot client reads this from `project.godot`:
+
+```text
+step3/questions_api_url
+```
+
+## Push Build
+
+`.github/workflows/questions-api.yml` builds and publishes the Questions API Docker image to GitHub Container Registry on pushes to `main`.
+
+Set deployment hosting to consume:
+
+```text
+ghcr.io/<owner>/<repo>/questions-api:latest
+```