Add new issue template "Get help"

Add a new issue template for folks who just need help using Premake, and who aren't trying to log a bug or request a feature.

.github/ISSUE_TEMPLATE/get-help.md

@@ -0,0 +1,25 @@
+---
+name: Get help
+about: Get help using Premake and its scripting features
+title: ''
+labels: support-request
+assignees: ''
+
+---
+
+**What are you trying to do?**
+A short, concise description of the outcome you are trying to achieve, ex. "Add build settings to a specific file".
+
+**What problem are you having?**
+A clear and concise description of the problem that is blocking you from your desired outcome, ex. "Premake is crashing with this error message: ..." or "I don't know how to do it."
+
+**What have you tried so far?**
+Describe any steps you've already taken to try to get past this issue.
+
+**What version of Premake are you using?**
+`premake5 --version` will show you the version. If you are running a "-dev" 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.
+
+*(You can now [support Premake on our OpenCollective](https://opencollective.com/premake). Your contributions help us spend more time responding to issues like these!)*