add simple readme to test_project

test_project/README.md

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+# vite-plugin-runtime-config Test Project
+
+This project exists to test and demonstrate the usage of _vite-plugin-runtime-config_.
+
+It consists of a very minimal vue component ([App.vue](./App.vue)) and a minimal [index.html](./index.html) that reference runtime configuration through `window.config` as well as `{{ … }}` syntax.
+The values of these configurations is defined in [.env](./.env).