added get_groups function

Author: wogsland

CmixAPIClient/project.py

@@ -22,3 +22,9 @@ def get_sources(self):
         project_error = 'CMIX returned a non-200 response code while getting project sources'
         project_response = self.client.api_get(project_endpoint, project_error)
         return project_response
+
+    def get_groups(self):
+        project_endpoint = 'projects/{}/groups'.format(self.project_id)
+        project_error = 'CMIX returned a non-200 response code while getting project groups'
+        project_response = self.client.api_get(project_endpoint, project_error)
+        return project_response

README.md

@@ -50,6 +50,7 @@ A Python client library for the [Dynata Cmix API](https://wiki2.criticalmix.net/
 
 ### CmixProject
 
+    get_groups()
     get_project()
     get_sources()
 

tests/test_project.py

@@ -48,3 +48,6 @@ def test_get_project(self):
 
     def test_get_sources(self):
         self.helper_get('get_sources', '/{}/sources'.format(self.project_id))
+
+    def test_get_groups(self):
+        self.helper_get('get_groups', '/{}/groups'.format(self.project_id))