ISS-335 Start of bitbucket docs (#23)

ISS-335 added readme and image files

ci/bitbucket/README.md

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+# Install the Bitbucket Pipeline
+
+## Create a “Repository Access Token” for Pixee
+
+1. Open your repo in Bitbucket and click on “Repository Settings” from the left navigation. 
+
+<img src="../assets/bitbucket/settings.png" width=300/>
+
+2. Under “Security” click on “Access Tokens” 
+
+<img src="../assets/bitbucket/access_tokens.png" width=300/>
+
+3. Click on the “Create Repository Access Token” 
+4. Give the token a name (Pixee for example) and check the box for under “Pull request” for “write” access. This will add all the other necessary scopes automatically. 
+
+<img src="../assets/bitbucket/scopes.png" width=400/>
+
+5. This will give you a key that you can copy for the next step. 
+
+<img src="../assets/bitbucket/access_token_view.png" width=400/>
+
+## Add the “Repository variables”
+
+1. Click on “Repository variables” 
+
+<img src="../assets/bitbucket/variables.png" width="200" />
+
+2. Add a new one with the name “BITBUCKET_ACCESS_TOKEN_PIXEE” and the value from the step above. 
+
+<img src="../assets/bitbucket/access_token_var.png" width="500" />
+
+## Add the pipeline: 
+
+1. Under “Pipelines” Click settings and make sure pipelines are enabled for the branch. 
+2. Add the following bitbucket-pipelines.yml file to your project.