Add issue templates (#68)

Author: marefr

.github/ISSUE_TEMPLATE/1-bug_report.md

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+---
+name: Bug report
+about: Report a bug
+labels: 'type: bug'
+---
+
+<!--
+Please use this template while reporting a bug and provide as much info as possible.
+Questions should be posted to https://community.grafana.com
+Refer to Grafana documentation to troubleshoot issues: https://grafana.com/docs/grafana/latest/administration/image_rendering/#troubleshooting
+-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Grafana Image Renderer version:
+- Grafana version:
+- Installed plugin or remote renderer service:
+- OS Grafana Image Renderer is installed on:
+- User OS & Browser:
+- Others:

.github/ISSUE_TEMPLATE/2-enhancement.md

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+---
+name: Enhancement request
+about: Suggest an enhancement or new feature
+labels: 'type: feature request'
+---
+
+<!-- Please only use this template for submitting enhancement requests -->
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Documentation
+    url: https://grafana.com/docs/grafana/latest/administration/image_rendering
+    about: For help, please read documentation and troubleshooting guide first.
+  - name: Questions & Help
+    url: https://community.grafana.com
+    about: Please ask and answer questions here.