Added Templates for Issue and Pull Requests (#161)

.github/ISSUE_TEMPLATE.md

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+Before writing an issue, please make sure you're talking about the native application and not the Cordova one. If you are looking to open an issue to the Cordova application, go to this URL: https://github.com/RocketChat/Rocket.Chat.Cordova.
+
+- Your Rocket.Chat.Android app version: ####
+<!-- Make sure you are running the latest version (which can be found on the hostname screen or by opening the side menu and then clicking on the chevron alongside username -->
+
+- Your Rocket.Chat.iOS app version: ####
+<!-- Make sure you are running the latest version (which can be found on the hostname screen or by opening the side menu and then clicking on the chevron alongside username -->
+
+- Your Rocket.Chat server version: ####
+
+- Device model (or emulator) you're running with: ####
+<!-- e.g. For android : Nexus 7 - Android 6.0.1 -->
+<!-- e.g. For iOS : iPhone 6 - iOS 11.2
+
+- Steps to reproduce:
+<!-- Stack traces may help too. -->
+
+**The app isn't connecting to your server?**
+Make sure your server supports WebSocket. These are the minimum requirements for Apache 2.4 and Nginx 1.3 or greater.

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- INSTRUCTION: Keep the line below to notify all core developers about this new PR -->
+@RocketChat/ReactNative
+
+<!-- INSTRUCTION: Inform the issue number that this PR closes, or remove the line below -->
+Closes #ISSUE_NUMBER
+
+<!-- INSTRUCTION: Tell us more about your PR with screen shots if you can -->