[General] Add issue templates

.github/ISSUE_TEMPLATE/get-help.md

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+---
+name: Get help
+about: Get help using IW4x
+title: ''
+labels: discussion
+assignees: ''
+
+---
+
+_Do not open an issue here if you need help with modding or have a problem getting the client to run.
+It is very likely your problem will be resolved by reading the [FAQ](https://xlabs.dev/iw4x_faq) carefully.
+Ask in `iw4x-support` or `iw4x-modding` channels on the [Discord](https://discord.gg/sKeVmR3) server if you still have problems.
+If this does not apply, please continue by filling in the template below._
+
+**What are you trying to do?**
+A short, concise description of the outcome you are trying to achieve.
+
+**What problem are you having?**
+A clear and concise description of the problem that is blocking you from your desired outcome, ex. "IW4x is crashing with this error message: ..."
+Please walk us through the steps you have taken when you encountered this problem.
+If IW4x is crashing, include the minidump file and the crash address in text form. Screenshots showing the message box with the crash address are not acceptable.
+
+**What have you tried so far?**
+Describe any steps you've already taken to try to get past this issue. Have you found a workaround?
+
+**What version of Premake are you using?**
+`iw4x.exe -version` will show you the version. Please make sure you are up to date with the latest master branch.
+
+**Anything else we should know?**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/request-a-feature.md

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+---
+name: Request a feature
+about: Suggest a new feature or enhancement
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+_Before opening a new feature request, please see [Issues](https://github.com/XLabsProject/iw4x-client/issues) and check that a similar issue does not already exist.
+If this a new request, help us help you by filling in the template below._
+
+**What problem will this solve?**
+A clear and concise description of the problem this new feature is meant to solve, ex. "There is something wrong with the game" or "There is something wrong with IW4x's source code".
+Please limit your request to a single feature; create multiple feature requests instead.
+
+**What might be a solution?**
+A clear and concise description of what you want to happen. If you are proposing changes to IW4x's source code, tell us which component you want to be changed.
+If you propose changes to the game, you may use images or videos to illustrate what aspect of the game should be changed.
+
+**What other alternatives have you already considered?**
+A clear and concise description of any alternative solutions or features you've considered.
+It may help others to find workarounds until the problem is resolved.
+
+**Anything else we should know?**
+Add any other context or screenshots about the feature request here.