Adds test documentation

doc/test.md

@@ -0,0 +1,22 @@
+# Running tests #
+
+## Intro ##
+
+Tests on `Tracim` lays on [`nose` test tool](http://nose.readthedocs.io/en/latest/).
+
+In order to use the `nosetests [...]` commands, change your current directory to be `tracim/` from the root of the project, also usually named `tracim/` :
+
+    (tg2env) user@host:~/tracim$ cd tracim/
+    (tg2env) user@host:~/tracim/tracim$
+
+## All tests ##
+
+    nosetests
+
+## One test ##
+
+    nosetests tracim/tests/models/test_content.py:TestContent.test_query
+
+## Allow debugger ##
+
+    nosetests -s