add GitHub issue template (.yaml) and Pull request template (.md) files

.github/ISSUE_TEMPLATE/new_issue.yaml

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+name: "Create a new issue"
+description: "Please provide more information about the problem"
+title: "[robottelo]"
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description of the problem
+      description: A brief description of the question or issue or exisiting PR, also include what you tried and what didn't work.
+      placeholder: '[Provide a clear and concise description of the problem or issue]'
+    validations:
+      required: true
+  - type: textarea
+    id: additional-info
+    attributes:
+      label: Additional information
+      description: Include any additional information, context, dependancy, or notes that may be relevant to this PR.
+      placeholder: '[Link to any related GitHub issues or pull requests, also include any error, output, log if needed]'
+      value: 'GitHub issue | Pull Request | Error | Output | Log'
+    validations:
+      required: false

.github/PULL_REQUEST_TEMPLATE/new_pull_request.md

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+### Problem Statement
+Provide a description of the problem or issue you are addressing with this PR
+### Solution
+Describe the solution you are proposing to address the problem
+### Test Cases
+Test cases that you have added or modified to verify the changes made in this PR
+### Test information
+Test description, setup required
+### Test steps & Expected result
+```  
+Step 1.    
+Step 2.    
+
+Expected result:
+```
+### Related Issues
+Link to any related GitHub issues or PR from robottelo, airgun, nailgun
+### Additional Notes
+Any additional notes for reviewers that may be relevant to this PR