Added support for SSM delete_parameters

Signed-off-by: Ali Rizwan <ari@hellofresh.com>

moto/ssm/responses.py

@@ -26,6 +26,22 @@ class SimpleSystemManagerResponse(BaseResponse):
         self.ssm_backend.delete_parameter(name)
         return json.dumps({})
 
+    def delete_parameters(self):
+        names = self._get_param('Names')
+        result = self.ssm_backend.delete_parameters(names)
+
+        response = {
+            'DeletedParameters': [],
+            'InvalidParameters': []
+        }
+
+        for name in names:
+            if name in result:
+                response['DeletedParameters'].append(name)
+            else:
+                response['InvalidParameters'].append(name)
+        return json.dumps(response)
+
     def get_parameters(self):
         names = self._get_param('Names')
         with_decryption = self._get_param('WithDecryption')