Add a readme

Readme.md

@@ -0,0 +1,26 @@
+csc360-a1-shell
+===============
+
+CSC360 assignment 1: `a1.pdf` is the spec. It's a small shell.
+
+The initial C implementation lives in `c/`, and a Ruby implementation and test suite lives in `ruby/`. The Ruby version is just for fun. The Ruby tests can run against any implementation and are used to test the C version as well.
+
+We assume that you have a C compiler.
+
+Bootstrap installs readline and gems:
+
+    make bootstrap
+
+Build and test both the C and Ruby versions:
+
+    make
+
+Build and test just the C version:
+
+    make c
+
+Test the Ruby version:
+
+    make ruby
+    # or
+    cd ruby && bundle exec rake