Add tobiko setup document

This patch adds a document with some pycharm & tobiko configuration
advices.

Change-Id: I51c127e19edc1b8dc538109d2970061cf795adc0

doc/source/contributor/index.rst

@@ -33,3 +33,4 @@ Project Contributor Guide
    :maxdepth: 2
 
    contributor
+   setup_tobiko_workstation

doc/source/contributor/setup_tobiko_workstation.rst

@@ -0,0 +1,58 @@
+.. _tobiko-setup-workstation:
+
+=================================
+How to setup a tobiko workstation
+=================================
+
+*This guide should help contributors to configure their workstation, so it would be easier for them to write tobiko*
+*test cases.*
+
+Configuring local test running and debugging
+--------------------------------------------
+
+Clone the tobiko repository::
+
+    git clone https://opendev.org/x/tobiko.git
+
+Create a tobiko.conf inside the tobiko directory, which will have::
+
+    [DEFAULT]
+
+    debug = true
+
+Inside the Tobiko directory, run::
+
+    tox -e py3
+
+Copy the path you see in the first line (it should contain something similar to *tobiko/.tox/py3*)
+
+On Pycharm:
+ * Create a new (pycharm) project with *Location = <the tobiko path>*
+
+ * In interpreter options tab, choose “*New environment using Virtualenv*”, with Location = *<tobiko-path>/.pycharm*, and then click on "*Create -> Create from Existing Sources*".
+
+ * Enter preferences (ctrl+alt+s in Linux)
+
+ * In Project Interpreter tab:
+    * Click * -> Add
+    * Choose "*Existing Environment*"
+    * In the Interpreter field, paste the path you copied after running the tox command, and add the "/bin/python3" suffix.
+
+      Example: the path *~/tobiko/.tox/py3/bin/python3* might be used, as tox provides the directory *~/tobiko/.tox/py3*, and we add */bin/python3*
+
+    * In Python Integrated Tools tab, under *Testing* section, set the *Default test runner* to be "*pytest*"
+
+Now verify your environment has the configuration options mentioned above by doing the following:
+Find tobiko/tests/unit/test_config.py in the left project window -> right click -> *Run pytest in test config*.
+
+All tests should pass. You could also debug tests by setting a breakpoint.
+
+Configuring proxy jump
+----------------------
+
+Make sure you can ssh to your remote host without a password:
+
+.. include:: ../user/_conf_credentials.rst
+    :start-after: define-your-ssh-variables:
+
+And that’s it!