version-control/README.md: Add a motivational paragraph

The text is adapted from 3976755 (Added the file for lesson 2,
2012-02-04), which I cherry picked out of boot-camps (where it is
d48ceea) [1].

[1] https://github.com/swcarpentry/boot-camps

diff --git a/version-control/README.md b/version-control/README.md
index 4380bdb45073e8c7b3f434c2c15a0938bbce8bff..6d488f98a53aab3a4de70a37a05f5902d83d8c21 100644 (file)
--- a/version-control/README.md
+++ b/version-control/README.md
@@ -1,3 +1,12 @@
+Version control is a way to keep a track of changing files and store a
+history of those changes and the motivation behind them.  This
+organized history allows many people in a collaboration to make
+changes concurrently, while staying up to date with changes made by
+their collaborators.  It also makes it easy to keep yourself organized
+if you store similar files in several different locations (e.g. a
+project that you develop on both your home computer and your work
+computer).
+
 Basic use
 =========