Add GitHub Issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us fix a problem with ColiseuPlayer
+
+---
+
+### Which version of the ColiseuPlayer are you using? 
+E.g. `1.0.11`
+
+### On which platform does the issue happen? 
+E.g. `iOS11`
+
+### Are you using Carthage? 
+If yes, specify the version (`carthage version`)
+
+### Are you using Cocoapods? 
+If yes, specify the version (`pod --version`)
+
+### Which version of Xcode are you using? 
+(`xcodebuild -version`)
+
+### What did you do?
+Describe the problem.
+```
+Add a short snippet of code to show the problem
+```
+
+### What did you expect to happen?
+Describe the expected outcome.
+
+### What happened instead?
+Describe what happened instead.

.github/ISSUE_TEMPLATE/enhancement_request.md

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+---
+name: Enhancement request
+about: Suggest an enhancement to ColiseuPlayer
+
+---
+
+### Problem description
+
+A description of a problem, workflow or integration that your suggestion would solve. If the problem is OS-specific, include that information here.
+
+### Preferred solution
+
+A description of what changes should be made to ColiseuPlayer to solve the problem.
+
+### Alternatives
+
+A description of any alternative solutions or enhancements considered.
+