Add issue templates, pull request template and contributing guidelines (

#22)

.github/CONTRIBUTING.md

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+# Contributing
+
+Before contributing a pull request, please [raise an issue](https://github.com/codesupport/code-review-tool/issues/new) stating:
+- What functionality you are adding
+- Why you are adding this functionality (what's the benefit)
+
+Discussion will then take place on the GitHub Issue by members of the community allowing them to express their thoughts.
+However, the final decision will be made by the [CodeSupport Discord](https://codesupport.dev/discord) moderation team.
+
+We advise you to only start working on the functionality once your Issue receives the "[accepted](https://github.com/codesupport/code-review-tool/issues?q=is%3Aopen+is%3Aissue+label%3Aaccepted)" label.

.github/ISSUE_TEMPLATE/bug.md

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+---
+
+name: Bug
+about: Report a bug
+title: ''
+labels: 'bug'
+assignees: ''
+---
+
+### Overview
+<!-- Please describe the bug, including your browser and operating system versions, below: -->
+
+### Expected Behaviour
+<!-- Please describe how you expect this functionality to work: -->
+
+### Actual Behaviour
+<!-- Please describe how this functionality is actually working: -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Discord Community
+    url: https://codesupport.dev/discord
+    about: For general CRT discussion and support please visit our Discord

.github/ISSUE_TEMPLATE/feature.md

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+---
+
+name: Feature
+about: Suggest new functionality
+title: ''
+labels: 'enhancement'
+assignees: ''
+---
+
+### What Functionality Are You Suggesting?
+<!-- Please describe the functionality below: -->
+
+### Why Will This Benefit The Community?
+<!-- Please explain why this functionality would benefit our community below: -->

.github/PULL_REQUEST_TEMPLATE.md

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+Resolves #ISSUE_NUMBER_HERE
+
+### Overview
+<!-- Please bullet point the changes you have made below: -->
+- Change 1
+- Change 2