Update readme.md

Update readme

readme.md

@@ -8,3 +8,17 @@ Generates `ts` files from `proto` file definitions.
 curl -Lo protoc-gen-ts https://github.com/join-com/protoc-gen-ts/releases/download/[VERSION]/protoc-gen-ts-[VERSION] \
 && chmod +x protoc-gen-ts && sudo mv protoc-gen-ts /usr/local/bin
 ```
+
+## Usage
+
+```
+protoc proto/*.proto -I proto --ts_out=proto-ts
+```
+will generate TS implementations into `proto-ts` folder for all your proto files inside `proto`
+
+## Develop
+
+1. Follow [instructions](https://golang.org/doc/install) to install Go and add /usr/local/go/bin to the PATH environment variable
+2. Clone and navigate to repository and build package with `go install .`
+3. Inside `integrationTests` file run `yarn proto:build` to generate files for test proto files
+4. `yarn test` to run tests