Add issue templates, CODEOWNERS and PR templates

Author: Adrián García

.github/CODEOWNERS

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+# This is a comment.
+# Each line is a file pattern followed by one or more owners.
+
+# Current code owners
+# @adriangl -> Adrián García
+
+*   @adriangl

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: adriangl
+
+---
+
+**Device and SW details (please complete the following information):**
+ - Device: [e.g. Google Pixel 3]
+ - OS: [e.g. Android 9]
+ - Library Version [e.g. 1.0.0]
+
+**Summary and background of the bug**
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+Also attach notes or stack traces if applicable.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Current behavior**
+The summary of what currently happens in your use case.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement
+about: Create a report to propose new features and improvements
+title: ''
+labels: enhancement
+assignees: adriangl
+
+---
+
+**Summary and context of the enhancement**
+A clear and concise description of what the enhancement is and why it
+should be added.
+
+**Suggested implementation**
+Add suggestions about how the enhancement should be implemented.
+
+**Additional documentation**
+Useful links to review the enhancement.

.github/pull_request_template.md

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+### Github issue (delete if this does not apply)
+https://github.com/bq/mini-kotlin/issues/change_me_issue_number
+
+### PR's key points
+ 
+### How to review this PR?
+ 
+### Related Issues (delete if this does not apply)
+ 
+### Definition of Done
+- [ ] Tests pass
+- [ ] Works with Proguard
+- [ ] There is no outcommented or debug code left