[README] More install instructions.

Author: alloy

README.md

@@ -2,20 +2,37 @@
 
 ### Package
 
+First clone and build Relay packages:
+
+```
+git clone https://github.com/alloy/relay.git -b language-plugin
+cd relay
+yarn install
+yarn build
+cd dist/babel-plugin-relay && npm pack
+cd dist/react-relay && npm pack
+cd dist/relay-compiler && npm pack
+cd dist/relay-runtime && npm pack
+cd dist/relay-test-utils && npm pack
+cd ..
+```
+
+Then setup package:
+
 ```
-$ git clone https://github.com/kastermester/relay-compiler-language-typescript.git
-$ cd relay-compiler-language-typescript
-$ yarn install
+git clone https://github.com/kastermester/relay-compiler-language-typescript.git
+cd relay-compiler-language-typescript
+yarn install
 ```
 
 ### Example
 
 After following the above package steps:
 
 ```
-$ npm pack
-$ cd example
-$ yarn install
-$ yarn build
-$ yarn start
+npm pack
+cd example
+yarn install
+yarn build
+yarn start
 ```