add README file to explain how to use the git repo

diff --git a/README b/README
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index 0000000..fb7bdc0
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+++ b/README
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+Each of the different branches is available in the repository. Once you
+have cloned the default repository, you can download all branch and
+switch between them like:
+
+  git pull --all
+  git checkout color_style2
+
+To get a list of all branches, you can do:
+
+  git branch -a
+
+The branches should include three color and three black and white modes
+which you can switch between using "git checkout":
+
+  bw_style1
+  bw_style2
+  bw_style3
+  color_style1
+  color_style2
+  color_style3
+