PR and Issue template (#2163)

* PR template

* Issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: '[Bug]: '
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Logs**
+If applicable, please include the relevant logs that indicate a problem.
+
+**Operating System**
+Which OS you used to reveal the bug.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_spec.md

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+---
+name: Feature specification
+about: Discussion on design and implementation of new features for the Avalanche CLI.
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Context and scope**
+Include a short description of the context and scope of the suggested feature.
+Include goals the change will accomplish if relevant.
+
+**Discussion and alternatives**
+Include a description of the changes to be made to the code along with alternatives that were considered.
+
+**Open questions**
+Questions that are still being discussed.

.github/pull_request_template.md

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+## Why this should be merged
+
+## How this works
+
+## How this was tested
+
+## How is this documented