Add Readme

Author: benitav

demos/TodoSQLite/README.md

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+# .NET MAUI ToDo List Demo App
+
+## To test (we currently recommend testing on iOS):
+1. You need to have one of our Node.js self-host demos ([Postgres](https://github.com/powersync-ja/self-host-demo/tree/main/demos/nodejs) | [MongoDB](https://github.com/powersync-ja/self-host-demo/tree/main/demos/nodejs-mongodb) | [MySQL](https://github.com/powersync-ja/self-host-demo/tree/main/demos/nodejs-mysql)) running, as it provides the PowerSync server that this demo's SDK connects to.
+2. In the root directly run:
+   1. `dotnet run --project Tools/Setup`
+   2. `dotnet restore`
+3. cd into this directory: `* cd demos/TodoSQLite `
+4. run `dotnet build -t:Run -f:net8.0-ios`
+   1. Or specify an iOS simulator identifier e.g.: `dotnet build -t:Run -f:net8.0-ios -p:_DeviceName=:v2:udid=B1CA156A-56FC-4C3C-B35D-4BC349111FDF`
+
+## Current known issues:
+* Switching from offline to online mode isn't yet handled
+* Android has some instability
+