added README

README.md

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+# python-ldapdb slows down django tests significantly
+
+reproduce this behaviour using docker and docker-compose by running
+
+```
+$ docker-compose build
+[...]
+$ docker-compose run web python manage.py test
+Creating test database for alias 'default'...
+....
+----------------------------------------------------------------------
+Ran 4 tests in 0.153s
+
+OK
+Destroying test database for alias 'default'...
+$ docker-compose run web python manage.py test --settings mysite.fast_tests
+Creating test database for alias 'default'...
+....
+----------------------------------------------------------------------
+Ran 4 tests in 0.002s
+
+OK
+Destroying test database for alias 'default'...
+```
+
+`fast_tests` removes the `ldapdb.backends.ldap` database backend, which makes tests significantly faster.
+
+Notes:
+  * there is not a single code or tests which is acually using python-ldapdb
+  * speed slows down liniar with the number of tests, so slow down is not because of initial test overhead