add humble-navigation2

navigation2/.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please fill out the following pull request template for non-trivial changes to help us process your PR faster and more efficiently.-->
+
+---
+
+## Basic Info
+
+| Info | Please fill out this column |
+| ------ | ----------- |
+| Ticket(s) this addresses   | (add tickets here #1) |
+| Primary OS tested on | (Ubuntu, MacOS, Windows) |
+| Robotic platform tested on | (Steve's Robot, gazebo simulation of Tally, hardware turtlebot) |
+
+---
+
+## Description of contribution in a few bullet points
+
+<!--
+* I added this neat new feature
+* Also fixed a typo in a parameter name in nav2_costmap_2d
+-->
+
+## Description of documentation updates required from your changes
+
+<!--
+* Added new parameter, so need to add that to default configs and documentation page
+* I added some capabilities, need to document them
+-->
+
+---
+
+## Future work that may be required in bullet points
+
+<!--
+* I think there might be some optimizations to be made from STL vector
+* I see alot of redundancy in this package, we might want to add a function `bool XYZ()` to reduce clutter
+* I tested on a differential drive robot, but there might be issues turning near corners on an omnidirectional platform
+-->
+
+#### For Maintainers: <!-- DO NOT EDIT OR REMOVE -->
+- [ ] Check that any new parameters added are updated in navigation.ros.org
+- [ ] Check that any significant change is added to the migration guide
+- [ ] Check that any new features **OR** changes to existing behaviors are reflected in the tuning guide
+- [ ] Check that any new functions have Doxygen added
+- [ ] Check that any new features have test coverage
+- [ ] Check that any new plugins is added to the plugins page
+- [ ] If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists