Create contributing.md

Author: bootstraponline

contributing.md

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+# Contributing
+
+- Tests are run against [appium's master branch](https://github.com/appium/appium/blob/master/docs/en/contributing-to-appium/appium-from-source.md)
+- The tests are run using the [flaky gem](https://github.com/appium/flaky) on OS X
+- The `arc` command can be run from within the `ios_tests` or `android_tests` folder to open an interactive console
+
+### Run iOS tests
+
+iOS tests are run on the iOS 8.1 iPhone simulator.
+
+- `cd ios_tests`
+- `flake 3 ios` - Run all the iOS tests up to 3 times
+
+### Run Android tests
+
+Android tests require running on physical hardware. The emulator is unreliable.
+
+- `cd android_tests`
+- `flake 3 android` - Run all the Android tests up to 3 times