[graal] Add example script

Signed-off-by: inishchith <[email protected]>

Author: inishchith

graal/cocom.md

@@ -70,13 +70,13 @@ Once you've successfully installed Graal, you can get started real quick with th
 [2019-03-27 21:35:59,117] - Quest completed.
 ```
 
-- In the above graal output, you can read one commit item obtained which contains "analysis" attribute under "data".
+- In the above graal output, you can read one commit item obtained which contains `analysis` attribute under `data`.
 
 **Note:** Some of the intermediate output items are skipped for representational purposes.
 
 ## Using Graal as a Python script
 
-- We can also use the backend provided by Graal in python scripts via importing the appropriate modules. Show below is using `cocom` backend in a python script. [ Example: [graal_cocom_1.py](./scripts/graal_cocom_1.py) ]
+- We can also use the backend provided by Graal in python scripts via importing the appropriate modules. Shown below is using `cocom` backend in a python script. [ Example: [graal_cocom_1.py](./scripts/graal_cocom_1.py) ]
 
 ```python3
 #! /usr/bin/env python3

graal/scripts/graal_cocom_1.py

@@ -0,0 +1,14 @@
+#! /usr/bin/env python3
+from graal.backends.core.cocom import CoCom
+
+# URL for the git repo to analyze
+repo_uri = "http://github.com/chaoss/grimoirelab-graal"
+
+# directory where to mirror the repo
+repo_dir = "/tmp/graal-cocom"
+
+# Cocom object initialization
+cc = CoCom(uri=repo_uri, git_path=repo_dir)
+
+# fetch all commits
+commits = [commit for commit in cc.fetch()]