Add a summary of my opensource contributions

My GitHub represents everything 2011 and forward, so this covers the time
before then, when it wasn't so easy to see the proliferation of open source
contributions.

I may come back and add more post-GitHub things to this later.

opensource/index.md

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+# Open Source
+
+I've been a contributor to open source software for nearly 15 years. While
+my [GitHub profile](https://github.com/mattr-) has my most recent open source
+work, here's a timeline of other notable contributions I've made.
+
+**November 2002**: First email to an open source project. This particular
+email was to a KDE mailing list. KDE is a graphical desktop environment (a la
+macOS or Windows) for *nix based systems.
+
+**January 2003**: First patch submission to an open source project. I
+submitted a patch to the Linux from Scratch project to update their
+instructions for building a piece of software called Ghostscript, which can be
+used to render PDFs on Linux systems
+
+**2003 - 2011**: Heavy contributor to the KDE project. I often did bug triage,
+worked on an instant messenger program (Kopete), the KDevelop IDE and
+volunteered on the sysadmin team as well.
+
+**2006, 2007, 2008, 2011**: Mentor for KDE in the Google Summer of Code program