Add test suite instructions

.gitignore

@@ -2,3 +2,5 @@
 __pycache__
 htmlcov
 .coverage
+build
+env

README.md

@@ -3,10 +3,16 @@ This is work-in-progress.
 A basic syncronization utility for [vdir](https://github.com/untitaker/vdir).
 Should be able to sync both CardDAV and CalDAV in the end.
 
-## How to run
+## How to use
 
 Copy `config.example` to `~/.vdirsyncer/config` and edit it. You can use the
 `VDIRSYNCER_CONFIG` environment variable to change the path vdirsyncer will
 read the config from.
 
 Run `vdirsyncer --help`.
+
+## How to run the tests
+
+    pip install .
+    pip install -r dev_requirements.txt
+    py.test

dev_requirements.txt

@@ -0,0 +1,3 @@
+Radicale
+Werkzeug
+pytest

setup.py

@@ -25,5 +25,5 @@ setup(
     entry_points={
         'console_scripts': ['vdirsyncer = vdirsyncer.cli:main']
     },
-    install_requires=['argvard', 'requests']
+    install_requires=['argvard', 'requests', 'lxml']
 )