add readme

readme.md

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+# oauth2-proxy
+
+## usage
+
+example docker-compose config for raindrop api.
+
+```docker-compose
+  raindrop-api:
+    image: git.zatch.ru/tsivinsky/oauth2-proxy:latest
+    container_name: raindrop-api
+    restart: unless-stopped
+    expose:
+      - 5000
+    environment:
+      - AUTH_CONFIG=/config/config.json
+      - CLIENT_ID={raindrop client_id}
+      - CLIENT_SECRET={raindrop client_secret}
+      - REDIRECT_URI={url to this service}/oauth/callback
+      - API_URL=https://api.raindrop.io/rest/v1
+      - AUTH_URL=https://raindrop.io/oauth/authorize
+      - TOKEN_URL=https://raindrop.io/oauth/access_token
+    volumes:
+      - ./data/raindrop-api:/config
+```