[template] Update

.github/PULL_REQUEST_TEMPLATE

@@ -1,6 +1,9 @@
 <!-- Thanks for contributing to open-source-ios-apps 😊 -->
 
+**Please do not edit the README, instead make changes to `contents.json` **
+
 <!-- When making an addition: -->
+
 1. [ ] Project URL:
 2. [ ] One project per pull request
 3. [ ] Insert the project in alphabetical order
@@ -10,11 +13,30 @@
 
 <!-- Approved Format
 
-- App name: Short description 🔶
+At minimum
-- source url, i.e. https://github.com/username/project
-- https://itunes.apple.com/app/app-name/id-zzz
 
-or
+```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", "parse"],
+		"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
+  }
+```
 
-- [App name](source url): Short description 🔶
 -->