chore: add documentation for simple docker usage

Author: TristanSpeakEasy

README.md

@@ -1 +1,13 @@
-# speakeasy-proxy
+# speakeasy-proxy
+
+## Build Docker Image
+
+```bash
+docker build -t speakeasy-proxy .
+```
+
+## Run Docker Image
+
+```bash
+docker run --network="host" -p 3333:3333 -v $(pwd)/config.yaml:/config.yaml -v $(pwd)/httpbin.yaml:/httpbin.yaml -e SPEAKEASY_API_KEY='{API_KEY_HERE}' speakeasy-proxy
+```