improve guides (#590)

docs/CONTRIBUTING.md

@@ -2,24 +2,11 @@
 
 Want to add a feature or fix a bug? Great! This short guide will help.
 
-Development is best done using the example project. After you clone the repo, you need to
+Development is best done using the example project. After you clone the repo, see the example project's [readme](../example/README.md) for instructions on how to get it running.
 
-- get the config files from firebase: see [here](get-config-file.md)
-- cd to the example folder
-- run `yarn` to install deps
-- create `config.js` with the following content:
+When done, the example project should build successfully on both platforms and you should be able to sign in using the example app.
 
-```js
-export default {
-  webClientId: 'your-id.apps.googleusercontent.com',
-};
-```
-
-- cd to the `ios` folder and run `pod install`
-
-Now the example project should build successfully on both platforms and you should be able to sign in using the example app.
-
-### Making Change to Native Code
+### Making Changes to Native Code
 
 If you want to make changes to native code, just go ahead and import the example project into Android Studio, or open the `GoogleSigninSampleApp.xcworkspace` file in Xcode.
 
@@ -28,7 +15,7 @@ in Xcode, under Libraries, there'll be `RNGoogleSignIn` project.
 
 You may edit the source codes of those projects - that will edit the files in the `android` and `ios` folders in the repo root (not in `node_modules`) so you can easily commit those changes.
 
-### Making Change to JS Code
+### Making Changes to JS Code
 
 There is a little more work to make changes to JS code. The process is not ideal but works as follows:
 

example/README.md

@@ -2,11 +2,18 @@
 
 ### Setup
 
-- To get this running you should have:
+- To get this running you should have (see [how to get config files](get-config-file.md)):
   - `google-services.json` in your `android/app/`
   - `GoogleService-Info.plist` in `ios/` and linked in XCode by dragging it to the file tree.
 - Run `yarn` on project root to install required Javascript dependencies
 - Go to `ios/` and run `pod install` to install required native iOS dependencies
+- create `config.js` with the following content:
+
+```js
+export default {
+  webClientId: 'your-id.apps.googleusercontent.com',
+};
+```
 
 ### Running