Add README

Author: axic

README.md

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+# JSON-RPC Proxy
+
+This Python script (found in `scripts/jsonrpcproxy.py`) provides HTTP proxy to Unix Socket based JSON-RPC servers.
+Check out --help option for more information.
+
+## Use
+
+```bash
+jsonrpcproxy.py --backend_path ~/.ethereum/geth.ipc --proxy_url http://127.0.0.1:8545
+```
+
+These values above are the default ones too. If they match your current configuration, they can be ommitted.
+
+## License
+
+Apache-2.0