Initial QSfera import

Server/services/keepernotes/README.md

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+# Keeper Notes Service
+
+Small REST service for the `G:\Repos\QSfera\Keeper` Android app.
+
+## Run
+
+```powershell
+go run .\services\keepernotes\cmd\keepernotes -addr :8098 -data .\keeper-notes.json
+```
+
+The Android emulator can reach the host service through `http://10.0.2.2:8098`.
+
+## API
+
+* `GET /healthz`
+* `GET /api/notes`
+* `PUT /api/notes/{id}`
+* `DELETE /api/notes/{id}`
+
+Notes are stored in a JSON file configured by `-data` or `KEEPER_NOTES_DATA`.