Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!-- DO NOT SUBMIT SUPPORT REQUESTS OR "HOW TO" QUESTIONS HERE!
+Else it might be closed without further notice.
+
+If you have a question look into our wiki
+( https://github.com/FluidSynth/fluidsynth/wiki )
+or the developer resources
+( http://www.fluidsynth.org/api/ )
+
+If you still have a question, need support or want to discuss ideas, contact our mailing list:
+https://lists.nongnu.org/mailman/listinfo/fluid-dev
+
+Below is a form that shall help getting relevant information for bugs together.
+We strongly recommend to use it! Feel free to edit or remove inapplicable/unneeded parts.
+-->
+
+### FluidSynth version
+_Execute `fluidsynth --version` and provide the output._
+
+### Describe the bug
+_Provide a clear and concise description of the current situation, e.g. how the bug manifests._
+
+### Expected behavior
+_Provide a clear and concise description of what you expected to happen._
+
+### Steps to reproduce
+_Please explain the steps required to duplicate the issue, esp. if you are able to provide a sample application. E.g. how to start fluidsynth, what shell commands to enter, what midi events to send, etc._
+
+### Additional context
+_If you are able to illustrate the bug with an example, please provide simple
+source code below or as attached file. List any other information that is relevant to your issue, e.g. stack traces, related issues, build logs, suggestions on how to fix, links to related discussions at fluid-dev, etc._
+
+```
+insert code snippets, soundfonts or anything relevant here, or attach it as extra file(s) if it's too much
+```

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a concrete feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+<!-- DO NOT SUBMIT SUPPORT REQUESTS OR "HOW TO" QUESTIONS HERE!
+Else it might be closed without further notice.
+
+If you have a question look into our wiki
+( https://github.com/FluidSynth/fluidsynth/wiki )
+or the developer resources
+( http://www.fluidsynth.org/api/ )
+
+If you still have a question, need support or want to discuss ideas, contact our mailing list:
+https://lists.nongnu.org/mailman/listinfo/fluid-dev
+
+Below is a form that shall help getting relevant information for features together.
+Feel free to edit or remove inapplicable/unneeded parts.
+-->
+
+### Related discussion on the mailing list
+_Features should be discussed by the community. Historically, our community lives at the mailing list. Bring up your ideas there, before opening tickets. In case you already did that, provide a link to the thread._
+
+### Is your feature request related to a problem?
+_A clear and concise description of what the problem is._
+
+### Describe the solution you'd like
+_A clear and concise description of what you want to happen._
+
+### Describe alternatives you've considered
+_A clear and concise description of any alternative solutions or features you've considered._
+
+### Additional context
+_Add any other context or screenshots about the feature request here._