Adds PR and Issue template. (#2985)

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Report a Security Exploit
+    url: https://discord.gg/MwDDf6t
+    about: Please report serious security exploits and vulnerabilities to @PJB3005. (PJB#3482 on discord).
+  - name: Request a Feature
+    url: https://hackmd.io/@ss14/docs
+    about: Submit feature requests on our [discord server](https://discord.gg/ZBFGnb3) or checkout our design documentation on HackMD.

.github/ISSUE_TEMPLATE/issue_report.md

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+<!-- To automatically tag this issue, add the uppercase label(s) surrounded by brackets below, for example: [LABEL] -->
+
+## Description
+<!-- Explain your issue in detail, including the steps to reproduce it if applicable. Issues without proper explanation are liable to be closed by maintainers.-->
+
+**Screenshots**
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+**Additional context**
+<!-- Add any other context about the problem here. -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- The text between the arrows are comments - they will not be visible on your PR. -->
+<!-- To automatically tag this PR, add the uppercase label(s) surrounded by brackets below, for example: [LABEL] -->
+
+## About the PR <!-- Describe the Pull Request here. What does it change? What other things could this impact? -->
+
+**Screenshots**
+<!-- If applicable, add screenshots to showcase your PR. If your PR is a visual change, add
+screenshots or it's liable to be closed by maintainers. -->