added README.md

README.md

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+# SlowDowner
+music web player with slowdown option
+
+
+## Dependencies
+### Yarn
+This project uses Yarn as package manager, to install all needed dependencies run
+``` yarn ```
+in the project directory
+
+### Development
+to run the test server locally run
+``` yarn run start ```
+and in another terminal
+``` yarn run dev ```