add Readme

README.md

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+# Osu Oauth Middleware Server hosted on Vercel
+Route access token back to end user without them needing own Api credentials!
+
+# How to use:
+1. Fork Repo
+2. Deploy on Vercel 
+3. Create [Api Client](https://osu.ppy.sh/home/account/edit#oauth) use the Vercel Domain as Callback
+4. add Envoirment variables
+- SCOPE: [scopes](https://osu.ppy.sh/docs/index.html#scopes)
+- CALLBACK_URL: localy hosted endpoint to where the access_token should be send to
+- URL: vercel Domain
+- PORT: Vercel server Port / default is 9000
+- CLIENT_ID: client_id
+- CLIENT_SECRET: client_secret
+
+5. Add link to the vercel domain with port as state to /authoritze: 
+https://example.vercel.app/authorize?port=4200
+
+6. recieive anser at:
+https://localhost:4200/{CALLBACK_URL}?access_token={access_token}&refresh_token={refresh_token}&expires_in={expires_in}
+7. profit?
+
+## use at own risk, security holes might be in there