[meta] first-timers-only issue template (moveit#2385)

Co-authored-by: Felix von Drigalski <FvDrigalski@gmail.com>
Co-authored-by: Sebastian Jahr <jahr.sebastian@t-online.de>

Author: 3 people

.github/ISSUE_TEMPLATE/first_timers_only.md

@@ -0,0 +1,65 @@
+---
+name: First Timers Only Issue
+about: Create an issue to welcome a new contributor into the community.
+title: ''
+labels: first-timers-only
+assignees: ''
+
+---
+
+## Background
+
+Overview of your issue here.
+
+## Instructions
+Hi, this is a `first-timer-only` issue. This means we've worked to make it more legible to people who either **haven't contributed to our codebase before, or even folks who haven't contributed to open source before**.
+
+We're interested in helping you take the first step, and can answer questions and help you out along the way. Note that we're especially interested in contributions from underrepresented groups!
+
+We know that creating a pull request is the biggest barrier for new contributors. This issue is for you 💝
+
+If you have contributed before, **consider leaving this PR for someone new**, and looking through our general [bug](https://github.com/ros-planning/moveit/labels/bug) issues. Thanks!
+
+### 🤔 What you will need to know.
+
+Nothing. This issue is meant to welcome you to Open Source :) We are happy to walk you through the process.
+
+### 📋 Step by Step
+
+- [ ] 🙋 **Claim this issue**: Comment below. If someone else has claimed it, ask if they've opened a pull request already and if they're stuck -- maybe you can help them solve a problem or move it along!
+
+- [ ] 🗄️**Create a local workspace** for making your changes and testing [follwing these instructions](https://moveit.ros.org/install/source/)
+
+- [ ] 📝 **Update** the file(s) `$FILENAME`by applying the change shown in the diff below.
+
+```diff
+$DIFF
+```
+
+- [ ] 🤖 **Apply `clang-format-10`** auto formatting, [following these instructions](https://moveit.ros.org//documentation/contributing/code/?#clang-format-auto-code-formatting)
+
+- [ ] 💾 **Commit** your changes
+
+- [ ] 🔀 **Start a Pull Request**. There are two ways how you can start a pull request:
+1. If you are not familiar with GitHub or how to create a pull request, [here is a guide you can follow](https://guides.github.com/activities/hello-world/) on how GitHub works.
+2. If you are familiar with the terminal or would like to learn to use it, [here is a great tutorial](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github) on how to send a pull request using the terminal.
+
+- [ ] 🏁 **Done** Ask in comments for a review :)
+
+### Is someone else already working on this?
+
+🔗- We encourage contributors to link to the original issue in their pull request so all users can easily see if someone's already started on it.
+
+👥- **If someone seems stuck, offer them some help!**
+
+### 🤔❓ Questions?
+
+Don’t hesitate to ask questions or to get help if you feel like you are getting stuck. For example leave a comment below!
+Furthermore, you find helpful resources here:
+* [MoveIt FAQ](https://moveit.ros.org/documentation/faqs/)
+* [MoveIt Tutorials](https://ros-planning.github.io/moveit_tutorials/)
+* [MoveIt contribution guide](https://moveit.ros.org/documentation/contributing/)
+* [ROS Tutorials](https://wiki.ros.org/ROS/Tutorials)
+* [ROS Answers](https://answers.ros.org/questions/)
+
+**Good luck with your first issue!**