Add middleware

README.md

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+# Domain Router
+
+Reverse Proxy for routing subdomains to different ports on same host machine
+
+## Configuration
+```csv
+test.pablu.de;8181
+manga.pablu.de;8282
+pablu.de;8080
+<Url>;<local Port>
+```
+
+## Building
+
+### Build executable
+```sh
+make build
+```
+
+### Runnging with default config
+```sh
+make run
+```