Update README with quick instructions and markdown it

src/README.md

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+Inc: an incrementally developed compiler
+=======================================
+
+Setup instructions for Ubuntu x86
+---------------------------------
+
+- [Install Petite Chez Scheme](http://blog.acfoltzer.net/2011/01/installing-petite-chez-scheme-on-ubuntu/)
+- `$ sudo apt-get install libc6-dev-i386`
+
+Quick instructions to run all tests
+-----------------------------------
+    $ petite compiler.scm
+      > (compile-lib)     ;; just once
+      > (test-all)        ;; run all the tests
+
+Full original instructions
+--------------------------
+
+To run the tests, make sure that your compiler file is called
+`compiler.scm`, and that at the top of that file, you have:
+`(load "tests-driver.scm")` ; this should come first
+`(load "tests-1.1-req.scm")` ; and any other test files you may have.
+
+Also, make sure that your compiler defines the function
+`emit-program` that takes an expression and uses `emit` to emit the
+appropriate instructions.
+
+The `tests-driver` defines the procedure `test-all` that will run all
+the tests provided, get the output, redirect it to a file `stst.s`,
+and invokes gcc on that file as well as the startup.c file that you
+should have written, and the `lib.s` file that is generated from the
+`compile-lib` thunk, which you'll need to call once and every time you
+change the `emit-library` thunk, which you can define.
+
+The tests-driver is written for [Petite] Chez Scheme 7.  You can
+obtain a copy of Petite Chez Scheme from:
+  [http://www.scheme.com](http://www.scheme.com)
+
+The `tests-driver` also assumes that you have the GNU C compiler `gcc`
+already setup and added to your pathname.  How you do this depends
+on your platform.  If you have a different C compiler that you wish
+to use, you can edit the `tests-driver` yourself (look for the
+definition of the `build` procedure).
+
+If all is well, then invoking `petite` on your compiler and typing
+`(test-all)` should run all the tests as in the following sample
+transcript.
+
+    $ petite compiler.scm
+    Petite Chez Scheme Version 7.0a
+    Copyright (c) 1985-2005 Cadence Research Systems
+
+    > (test-all)
+      test 0:#f ... ok
+      test 1:#t ... ok
+      test 2:() ... ok
+      test 3:0 ... ok
+      test 4:1 ... ok
+      test 5:-1 ... ok
+      test 6:2736 ... ok
+      test 7:-2736 ... ok
+      test 8:536870911 ... ok
+      test 9:-536870912 ... ok
+      test 10:#\nul ... ok
+      ...
+      test 131:#\y ... ok
+      test 132:#\z ... ok
+      test 133:#\{ ... ok
+      test 134:#\| ... ok
+      test 135:#\} ... ok
+      test 136:#\~ ... ok
+      test 137:#\rubout ... ok
+      passed all 138 tests
+    >
+
+Enjoy.
+
+Abdulaziz Ghuloum <aghuloum@cs.indiana.edu>