Add github issue templates

[ci skip]

Author: sgotti

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug on the Agola web interface
+labels: bug
+
+---
+
+<!--
+
+Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!
+
+**NOTE:** Please submit only bug reports. For other question or if unsure ask on the [Agola Forum](https://talk.agola.io)
+
+-->
+
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Agola web version:
+- Others:

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Request
+about: Suggest an enhancement for Agola Web
+labels: enhancement
+
+---
+<!--
+
+Please only use this template for submitting enhancement requests
+
+-->
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/support.md

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+---
+name: Support Request
+about: Support request or question related to Agola Web
+---
+
+<!--
+
+STOP -- PLEASE READ!
+
+GitHub is not the right place for support requests or questions.
+
+Please use the [Agola Forum](https://talk.agola.io)
+
+-->