add issue templates (#410)

.github/ISSUE_TEMPLATE/10_bug_report.yml

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+name: Bug/Crash report
+description: Create a bug report to help us improve docker-postgis.
+labels:
+  - 'Bug'
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report correctly.
+
+        Please report only issues related to the docker-postgis.
+
+        If the issue is related to core PostgreSQL functionality, you should file the issue in the [Postgres Github](https://github.com/postgres/postgres).
+        
+
+  - type: textarea
+    id: what
+    attributes:
+      label: What is the bug or the crash?
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce the issue
+      description: |
+        Steps, sample docker-compose to reproduce the behavior. Screencasts or screenshots are more than welcome, you can drag&drop them in the text box.
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: about-info
+    attributes:
+      label: Versions
+      description: |
+        Check the version of PostgreSQL specified in the docker-compose. Finally paste here.
+        Do not make a screenshot.
+    validations:
+      required: true
+
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: |
+        Add any other context about the problem here.

.github/ISSUE_TEMPLATE/15_feature_request.yml

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+name: Feature request
+description: Suggest a feature idea for docker-postgis.
+labels:
+  - 'Feature Request'
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request correctly.
+
+  - type: textarea
+    id: what
+    attributes:
+      label: Feature description
+      description: A clear and concise description of what you want to happen. Ex. docker-postgis would rock even more if [...]
+    validations:
+      required: true
+
+  - type: textarea
+    id: Additional
+    attributes:
+      label: Additional context
+      description: |
+        Add any other context or screenshots about the feature request here. Open source is community driven, please consider a way to support this work either by getting a support contract, find someone to submit a pull request.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+contact_links:
+
+  - name: Question
+    url: https://gis.stackexchange.com/
+    about: >
+      Questions should go to the postgres-user mailing list at https://www.postgresql.org/list/
+      or other support forums such as https://gis.stackexchange.com/.
+      GitHub issues are for bug reports and suggestions for new features.
+
+
+