added README

README

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+=== USAGE:
+    pythonbrew [options] [init|install|installed|switch|off|version]
+    
+    # Initialize
+    pythonbrew init
+    
+    # Install pythonbrew
+    pythonbrew install
+    
+    # Install some Pythons
+    pythonbrew install Python-2.6.6
+    pythonbrew install Python-2.5.5
+    pythonbrew --build-options="CC=gcc_4.1" install Python-2.4.3
+    
+    # Switch python in the $PATH
+    pythonbrew switch Python-2.6.6
+    pythonbrew switch /path/to/Python-2.5.5/
+    pythonbrew switch /path/to/python
+    
+    # Disable pythonbrew
+    pythonbrew off
+    
+    # Version
+    pythonbrew version
+    
+=== COMMANDS:
+  = init
+    Run this once to setup the pythonbrew directory ready for installing
+    pythons into. Run it again if you decide to change PYTHONBREW_ROOT.
+  
+  = install Python-<version>
+      Build and install the given version of python.
+      
+  = installed
+      List the installed versions of python.
+      
+  = switch Python-<version>
+      Switch to the given version.
+
+  = switch /path/to/Python-dir/
+      Switch to the given version of python in directory.
+      
+  = switch /path/to/python
+      Switch to the given version of python.
+
+  = off
+      Disable pythonbrew.
+
+  = version
+      Show version.
+      
+=== OPTIONS:
+  = --force
+  = --build-options
+