Add github issues template.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name:  Bug report
+about: Found a bug in the Google Mobile Ads iOS examples? File it here.
+---
+<!-- DO NOT DELETE
+validate_template=true
+template_path=.github/ISSUE_TEMPLATE/bug_report.md
+-->
+### Step 0: Are you in the right place?
+
+  * For general technical questions, or help with project-specific issues like setting up ads in
+   your app, reach out to our support team on the
+   [Developer Forum](https://groups.google.com/forum/#!categories/google-admob-ads-sdk/ios).
+  * For assistance with your AdMob account, reach out to
+   [AdMob Support](https://support.google.com/admob/?hl=en#topic=7383088).
+  * For feedback on [our documentation](https://developers.google.com/admob/ios),
+   send  your feedback by pressing the **Send Feedback** button at the top right of the
+    documentation page you are on.
+  * For SDK-related issues not specific to this example code, please post the issue to our
+[support forum]((https://groups.google.com/forum/#!categories/google-admob-ads-sdk/ios)
+for comprehensive support.
+  * For issues related to __the code in this repository__, continue filing this GitHub issue.
+
+  * Once you've read this section and determined that your issue is appropriate for
+    this repository, **please delete this section**.
+
+### [REQUIRED] Step 1: Describe your environment
+
+  * Application path in this repo: _____
+  * Google Mobile Ads iOS SDK version: _____
+  * iOS version: _____ (eg iOS 10)
+  * Any specific devices issue occurs on: _____
+
+
+### [REQUIRED] Step 2: Describe the problem
+
+#### Steps to reproduce:
+
+What happened? How can we make the problem occur?
+This could be a description, log/console output, etc.
+
+If any modifications have been made to the example, please share a downloadable
+sample project that reproduces the bug. This greatly helps us to diagnose and
+fix the issue faster.
+
+#### Relevant Code:
+
+```
+// TODO(you): code here to reproduce the problem
+```

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Google Mobile Ads SDK support
+    url: https://groups.google.com/forum/#!categories/google-admob-ads-sdk/ios
+    about: Please file issues not related to the code in this repository,
+    such as SDK-, account- or project-specific issues at the official Google Mobile
+    Ads SDK developer support channel.
+  - name: AdMob Support
+    url: https://support.google.com/admob/?hl=en#topic=7383088
+    about: For assistance with your AdMob account setup and ads serving.
+  - name: Google Mobile Ads iOS Documentation
+    url: https://developers.google.com/admob/ios/quick-start
+    about: The place to get started with Google Mobile Ads SDK for iOS.