Adding an installation guide for Tobiko

Added document - /docs/installation.md

Change-Id: I1edd6b62c1bc1d19ad0b367dd3756cf4ca6cf38a

docs/installation.md

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+# Tobiko installation guide
+
+## Install pip
+
+curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
+sudo python get-pip.py
+
+## Install Virtual Environment
+
+sudo pip install virtualenv
+
+## Install dependencies
+
+sudo yum install gcc python-devel
+
+## Clone Tobiko
+
+git clone https://review.openstack.org/openstack/tobiko.git
+
+## Create Virtual Environment
+
+virtualenv ~/tobiko_venv && source ~/tobiko_venv/bin/activate
+
+## Install Tobiko
+
+cd tobiko
+pip install -r extra-requirements.txt
+pip install .