Merge pull request #374 from diamante0018/general-pr

[General] Add pull request template

.github/pull_request_template.md

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+**What does this PR do?**
+
+Thanks for the contribution! Please provide a concise description of the problem this request solves.
+
+**How does this PR change IW4x's behavior?**
+
+Are there any breaking changes? Will any existing behavior change?
+Specify the new expected behaviour if this PR adds a new gameplay feature or alters an existing game mechanic. You may provide an image or video showing the changes.
+
+**Anything else we should know?**
+
+Add any other context about your changes here.
+
+**Did you check all the boxes?**
+
+- [ ] Focus on a single fix or feature; remove any unrelated formatting or code changes
+- [ ] Mention any [related issues](https://github.com/XLabsProject/iw4x-client/issues) (put `closes #XXXX` in comment to auto-close issue when PR is merged)
+- [ ] Follow our [coding conventions](https://github.com/XLabsProject/iw4x-client/blob/master/CODESTYLE.md)
+- [ ] Minimize the number of commits