Add issue template.

.github/ISSUE_TEMPLATE.md

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+<!--
+For Bug report or feature requests, please fill out the relevant category below.
+-->
+
+## Bug report
+
+**Required Info:**
+
+- Operating System:
+  - <!-- OS and version (e.g. Ubuntu 18.04...) -->
+- ROS and ROS2 versions:
+  - <!-- versions of each ROS installation (e.g. ROS1 Melodic, ROS2 Crystal.)  -->
+- Failing component:
+  - <!-- Indicate which is the main failing component (e.g. Gazebo, MoveIt!, rviz2) -->
+  - <!-- If you have INSTALLATION related problems, use "INSTALLATION: stuck at some point"-->
+#### Steps to reproduce issue
+<!-- Detailed instructions on how to reliably reproduce this issue http://sscce.org/
+``` code that can be copy-pasted is preferred ``` -->
+```
+
+```
+
+#### Expected behavior
+
+#### Actual behavior
+
+#### Additional information
+
+<!-- If you are reporting a bug delete everything below
+     If you are requesting a feature deleted everything above this line -->
+----
+## Feature request
+
+#### Feature description
+<!-- Description in a few sentences what the feature consists of and what problem it will solve -->
+
+#### Implementation considerations
+<!-- Relevant information on how the feature could be implemented and pros and cons of the different solutions -->