Add Devstack installation guide in README.rst

Add  DevStak installation  guide for the freezer-api project.

Change-Id: I3187b652da0cf9e0b6211d8317d5cf3e50a4aba3

devstack/README.rst

@@ -34,7 +34,27 @@ To use the sqlachemy set the following environment variable::
 
     export FREEZER_BACKEND='sqlalchemy'
 
-This is a sample local.conf file for freezer developer::
+Running Freezer tempest tests
+=============================
+
+Install DevStack  step by step
+=============================
+
+
+1. Download DevStack::
+
+    git clone https://git.openstack.org/openstack-dev/devstack.git
+    cd devstack
+
+2. Add stack user and change devstack directory user group::
+   
+    ./create_stack_user.sh
+    
+    chown -R stack ./devstack/
+    chown -R stack.stack ./devstack/
+
+
+3. Add this repo as an external repository.This is a sample local.conf file for freezer developer::
     
     [[local|localrc]]
     ADMIN_PASSWORD=stack
@@ -56,5 +76,49 @@ This is a sample local.conf file for freezer developer::
     
     export FREEZER_BACKEND='sqlalchemy'
 
+4. Use stack user to run ``stack.sh``::
+
+    su stack
+    ./stack.sh
+
+5.You can source openrc in your shell, and then use the openstack command line tool to manage your devstack.::
+
+    souce  /opt/stack/devstack/openrc  admin admin
+
+Running Freezer tempest tests
+=============================
+1. Listing Freezer tempest tests::
+
+    tempest list-plugins
+
+2. Config the "tempest.conf" file::
+
+    cd /opt/stack/tempest
+    tox -e genconfig
+    cd /opt/stack/tempest/etc
+    cp tempest.conf.sample tempest.conf
+
+3. This is a sample "tempest.conf" file::
+
+    [auth]
+    admin_username = admin
+    admin_project_name = admin
+    admin_password = stack
+    admin_domain_name = Default
+    [identity]
+    uri_v3 = http://172.16.1.108/identity/v3
+
+4. Running freezer tempest tests::
+
+    cd /opt/stack/tempest
+    tempest run -r freezer_tempest_plugin
+
+5. Running  one tempest test case::
+
+    cd /opt/stack/tempest
+    tempest run  -r  freezer_tempest_plugin.tests.freezer_api.api.test_api_jobs.TestFreezerApiJobs.test_api_jobs_post
+    
+      
 For more information, see:
  https://docs.openstack.org/devstack/latest/index.html
+ https://docs.openstack.org/tempest/latest/