make new-mentor a pull request template (#120)

.github/PULL_REQUEST_TEMPLATE/new-mentor.md

@@ -0,0 +1,38 @@
+---
+name: New Mentor
+about: Information about a new mentor to be added to the list.
+title: ''
+labels: mentor application
+assignees: ''
+
+---
+
+<!--
+To apply please edit `_includes/mentors.md` to add an entry for yourself and open a PR with the changes.
+
+If this is your first time contributing to open source check out https://opensource.guide/how-to-contribute/#how-to-submit-a-contribution for guidance on how to submit a contribution.
+
+The various recommended sections are documented below along with an example of how to format it.
+
+Preferred Name: This is optional, you can go by just your online handle if you prefer.
+
+Github Handle: This can be any handle - GitHub is just recommended - but this section is not a substitute for the contact section.
+
+Pronouns: This section is optional. If you'd prefer to leave this blank or remove it, that's fine, but it's helpful to gender non-conforming people if everyone lists their pronouns so they don't feel singled out; normalizing specifying your pronouns gives everyone more freedom of expression.
+
+Contact: Your preferred method of contact.
+
+Spoken Languages: Languages you're comfortable mentoring in; if you do not specify this, English will be assumed. Please _emphasize_ your preferred language if you list more than one.
+
+Topics: Topics of interest or projects that you work on that you're comfortable mentoring.
+
+Additional Resources: Any other learning resources that you maintain that you would like to share.
+
+# Example
+
+### Jane Lusby ([@yaahc](https://github.com/yaahc))
+* **Pronouns**: she/her
+* **Contact**: Twitter ([@yaahc_](https://twitter.com/yaahc_))
+* **Spoken Languages**: English
+* **Topics**: Beginners, community outreach, cargo, clippy, tracing, CLI
+-->