add issue and feature request templates (#793)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug encountered while using Pharos
+
+---
+<!-- 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!-->
+
+<!--
+If you are reporting a new issue, make sure that we do not have any duplicates
+already open. You can ensure this by searching the issue list for this
+repository. If there is a duplicate, please close your issue and add a comment
+to the existing issue instead.
+
+If you suspect your issue is a bug, please edit your issue description to
+include the BUG REPORT INFORMATION shown below. If you fail to provide this
+information within 7 days, we cannot debug your issue and will close it. We
+will, however, reopen it if you later provide the information.
+
+---------------------------------------------------
+GENERAL SUPPORT INFORMATION
+---------------------------------------------------
+
+The GitHub issue tracker is for bug reports and feature requests.
+General support for **Pharos** can be found at the following locations:
+
+- Slack - kontena.slack.com
+
+For commercial support options, visit: https://www.kontena.io/pharos#pricing
+
+-->
+
+
+**What happened**:
+
+<!--
+    If possible, include also the debug traces by re-running pharos up -d ...
+
+    You can always share the debug logs through gist, pastebin or some other service.
+
+    Remember to clear out any sensitive information from the logs.
+-->
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Pharos version (use `pharos --version`):
+- Cloud provider or hardware configuration:
+- OS (e.g. from /etc/os-release; both for the client and for the used nodes):
+- Others:
+
+**cluster.yml:**
+
+<!--
+    If possible, share the cluster.yml configuration, at least the relevant parts of it.
+    It helps a lot when debugging and trying to reproduce the issue.
+-->
+

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Request
+about: Suggest an enhancement to the Pharos project
+
+---
+<!-- Please only use this template for submitting enhancement requests -->
+
+**What would you like to be added**:
+
+**Why is this needed**:
+
+
+**Example cluster.yml**:
+
+<!-- Add here example of the cluster.yml for the relevant parts for this new feature. I.e. how you would see this new feature configured. -->