Add repo specific issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug
+labels: bug
+---
+
+<!-- If you're not sure whether your problem is a bug, please ask a question at
+http://answers.gazebosim.org instead.-->
+
+## Environment
+* OS Version: <!-- e.g, Ubuntu 20.04 -->
+* Source or binary build?
+  <!-- If binary, which version? -->
+  <!-- If source, which branch and what is the latest commit? -->
+* If this is a GUI or sensor rendering bug, describe your GPU and rendering system. Otherwise delete this section. <!-- If you do not know some values, leave them out. But please, at least give a try to finding them - they are really helpful when debugging rendering errors. -->
+    - Rendering plugin: [ogre | ogre2]. <!-- You can find it in the logs of Gazebo it outputs to console when you launch it with `-v 3` or `-v 4` argument. -->
+      - [ ] Sensor rendering error. <!-- Search for message like "[Msg] Loading plugin [ignition-rendering-ogre]" (not starting with "[GUI]"). -->
+      - [ ] GUI rendering error. <!-- Search for message like "[GUI] [Msg] Loading plugin [ignition-rendering-ogre2] -->
+    - EGL headless mode:
+      - [ ] Running in EGL headless mode <!-- only available since Ignition Fortress, GPU display is specified as /dev/dri/card* instead of :0 -->
+    - Generally, mention all circumstances that might affect rendering capabilities: <!-- remove lines that do not apply to keep the list short -->
+      - [ ] running on a dual GPU machine (integrated GPU + discrete GPU)
+      - [ ] running on a multi-GPU machine (it has multiple discrete GPUs)
+      - [ ] running on real hardware
+      - [ ] running in virtual machine
+      - [ ] running in Docker/Singularity
+      - [ ] running remotely (e.g. via SSH)
+      - [ ] running in a cloud
+      - [ ] using VirtualGL, XVFB, Xdummy, XVNC or other indirect rendering utilities
+      - [ ] GPU is concurrently used for other tasks
+        - [ ] desktop acceleration
+        - [ ] video decoding (i.e. a playing Youtube video)
+        - [ ] video encoding
+        - [ ] CUDA/ROCm computations (Tensorflow, Torch, Caffe running)
+        - [ ] multiple simulators running at the same time
+      - [ ] other...
+    - Rendering system info:
+      - On Linux, provide the outputs of the following commands:
+          ```bash
+          LANG=C lspci -nn | grep VGA  # might require installing pciutils
+          echo "$DISPLAY"
+          LANG=C glxinfo -B | grep -i '\(direct rendering\|opengl\|profile\)'  # might require installing mesa-utils package
+          ps aux | grep Xorg
+          sudo env LANG=C X -version  # if you don't have root access, try to tell the version of Xorg e.g. via package manager
+          ```
+      - On Windows, run `dxdiag` and report the GPU-related information.
+      - On Mac OS, open a terminal and type `system_profiler SPDisplaysDataType`. Copy the output here.
+        <!-- Please note that GUI rendering is not supported on macOS. -->
+    - [ ] Please, attach the ogre.log or ogre2.log file from  `~/.ignition/rendering` <!-- Choose the relevant version based on what you checked in the "Rendering plugin" question. -->
+
+<details>
+
+```
+# paste log here
+```
+
+</details>
+
+## Description
+* Expected behavior: <!-- Tell us what you expected to happen -->
+* Actual behavior: <!-- What happened instead -->
+
+## Steps to reproduce
+<!-- Provide steps so we can try to reproduce this issue -->
+
+1.
+2.
+3.
+
+## Output
+<!-- Provide screenshots, console logs, backtraces, and/or anything that could
+be useful to us resolving this issue -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Request a new feature
+labels: enhancement
+---
+
+<!-- If you're not sure on the specifics of the feature or would like a broader
+discussion, please consider posting a proposal to
+http://community.gazebosim.org/ instead.-->
+
+## Desired behavior
+<!-- Describe the current problem and the feature you want implemented.-->
+
+## Alternatives considered
+<!-- Describe alternate solutions or features you've considered.-->
+
+## Implementation suggestion
+<!-- Provide a suggestion on how to implement this feature, which could help us
+expedite this implementation.-->
+
+## Additional context
+<!-- Provide any other additional context (e.g., screenshots) about your feature
+request.-->