adding gcp-http-lb role

roles/gcp-http-lb/README.md

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+gcp-http-lb
+=========
+
+This role helps you set up a Google Cloud Load Balancer.
+
+Requirements
+------------
+
+- requests Python library
+- googleauth Python library
+
+Role Variables
+--------------
+
+```
+  gcp_http_lb_backend: the selflink for the backend that this load balancer will be supporting
+  gcp_project: the name of your gcp project
+  service_account_file: the path to your service account JSON file
+```
+
+Example Playbook
+----------------
+
+    - hosts: local
+      vars:
+        gcp_http_lb_backend: projects/project/zones/us-central1-c/instanceGroups/my-instance-group
+      roles:
+         - role: gcp-http-lb
+
+License
+-------
+
+Apache2
+
+Author Information
+------------------
+
+Google Inc.