Add a list of user contributed resources

Author: seisman

doc/index.rst

@@ -22,6 +22,7 @@
     install.rst
     tutorials/first_figure.rst
     gallery/index.rst
+    user_contributions.md
 
 .. toctree::
     :maxdepth: 2

doc/user_contributions.md

@@ -0,0 +1,20 @@
+# User Contributed Resources
+
+Below is a curated collection of user contributed PyGMT resources.
+
+*To add your contribution to this collection, submit a recommendation via a
+[pull request](https://github.com/GenericMappingTools/pygmt/blob/master/doc/user_contributions.md).*
+
+---
+
+## Tutorials
+
+- [2021 PyGMT course at the UAF Geophysical Institute](https://github.com/liamtoney/gi-pygmt-2021) by Liam Toney
+- [Remote Online Sessions for Emerging Seismologists (ROSES): Unit 8 - PyGMT](https://www.iris.edu/hq/inclass/lesson/728) by Liam Toney
+- [PyGMT Tutorial in 2021](https://github.com/MIGG-NTU/PyGMT2021) by MIGG-NTU
+- [PyGMT Workshop at FOSS4G Oceania 2019](https://github.com/GenericMappingTools/foss4g2019oceania) by Wei Ji
+
+## Examples
+
+- [GMT and PyGMT plotting examples](https://github.com/michaelgrund/GMT-plotting) by Michael Grund
+- [NZ Antarctic Science Conference 2021 poster](https://github.com/weiji14/nzasc2021) by Wei Ji