add readme.

README.md

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+# dqx_en_launcher
+
+Modifies the DQX launcher with a number of English assets to make for a more readable experience to an English audience.
+
+# ci
+
+This builds on pushes to main and tags.
+
+On pushes to main, check the GHA logs for the "Build launcher exe" step and make sure the log output looks OK. For tags, this will build and create a new release, attaching the modified executable to the release.
+
+# updating
+
+- Open a PR and replace `DQXLauncher.exe` in the `assets` folder with the latest launcher
+- Merge PR and verify that the executable built (check the previous GHA logs)
+- Cut a new tag, which will publish a new release
+
+# development
+
+You can build this locally, but the asset swaps for the two ETPs folders in `assets/ETP` are only done in CI. This only builds locally with the ETPs that were already in the executable.
+
+To run:
+
+```powershell
+cd app
+port_assets.bat
+```
+
+This will spit out a `DQXLauncher.log` file, and if successful, a `DQXLauncher.exe` in the `app` directory.