[contributing] Create

.github/CONTRIBUTING.md

@@ -0,0 +1,47 @@
+To contribute to`open-source-ios-apps`, please update the **contents.json** file (this will generate the README)
+
+## Add a new project 
+
+Adding a `JSON` entry
+
+### New entries go to the end of the file
+
+At the end of contents.json, add an entry at `}]`
+
+```js
+		"stars": 100
+	}] // here
+}
+```
+
+Insert a comma between `}` and `]` and create a new entry with the following format
+
+### Format 
+
+At minimum
+
+```js
+  {
+		"title": "MrCode", 
+		"category": "github",
+		"description": "GitHub iPhone app that can cache Markdown content",
+		"source": "https://github.com/haolloyin/MrCode" // note, no comma on last line
+  }
+```
+
+Optionally
+
+```js
+  {
+		"title": "MrCode", 
+		"category": "github",
+		"description": "GitHub iPhone app that can cache Markdown content",
+		"lang": "zho",
+		"source": "https://github.com/haolloyin/MrCode",
+		"itunes": "https://itunes.apple.com/app/id1234567890",
+		"tags": ["swift"],
+		"stars": 200
+  }
+```
+
+Thanks for contributing :tada: