Initial open sourcing of MuJoCo.

PiperOrigin-RevId: 450374687
Change-Id: Ie3225a46ce095fc28ae8e63c326a640261f562bb

.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: ''
+
+---
+
+**How to submit a good bug report**
+
+- Are you sure this is a bug? If not, consider using the "Ask for help" or "Feature request" templates.
+
+- Use a clear and descriptive title.
+
+- Make it easy to reproduce the problem.
+
+- Include a ***minimal*** model that demonstrates the problem. If the model is small, include it as inline XML. If it requires binary assets, attach it as a zip file.
+
+- Include a screenshot or video, if relevant.
+
+- Include the following context:
+  - Operating system.
+  - MuJoCo version (and if the bug is new, the version where it used to work).
+  - For Python issues, what bindings are you using (i.e `mujoco`, `dm_control`, `mujoco-py`)?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for MuJoCo
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**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.

.github/ISSUE_TEMPLATE/help.md

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+---
+name: Help
+about: Ask for help with MuJoCo
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**How to ask for help**
+
+- Take a step back and tell us what you're trying to accomplish, and in what context. The more information you give, the better the answers you will get.
+
+- If relevant, include a ***minimal*** model that demonstrates the problem. If the model is small, include it as inline XML. If it requires binary assets, attach it as a zip file.
+
+- Include a screenshot or video, if relevant.