Misc changes

Fixing gnbsim reference
Adding sdcore logo image
separated configuration section

Change-Id: Ib6ec73d8528a3e197c0e19be6a3ee7c1942c6211
diff --git a/configuration/config_rest.rst b/configuration/config_rest.rst
new file mode 100644
index 0000000..63d6a76
--- /dev/null
+++ b/configuration/config_rest.rst
@@ -0,0 +1,129 @@
+Configuration using REST Interface
+==================================
+
+You can decide to use any other tool to generate REST messages towards SD-Core to configure
+subscribers, device groups and network slice
+
+
+Subscriber Configuration through REST Interface
+"""""""""""""""""""""""""""""""""""""""""""""""
+
+Below example configures subscriber `208014567891209` in the SD-Core
+
+.. code-block::
+
+  - Post:
+    URL: `http://<config-service-name-or-ip>:<port>/api/subscriber/<imsi-xxx>`
+    Ex: `http://<config-service-name-or-ip>:<port>/api/subscriber/<imsi-208014567891209>`
+
+    Request Body:
+
+        {
+            "UeId":"208014567891209",
+            "plmnId":"20801",
+            "opc":"d4416644f6154936193433dd20a0ace0",
+            "key":"465b5ce8b199b49faa5f0a2ee238a6bc",
+            "sequenceNumber":"96"
+        }
+
+  - Delete:
+    URL: `http://<config-service-name-or-ip>:<port>/api/subscriber/<imsi-xxx>`
+    Ex: `http://<config-service-name-or-ip>:<port>/api/subscriber/<imsi-208014567891209>`
+
+
+Device Group Configuration through REST Interface
+"""""""""""""""""""""""""""""""""""""""""""""""""
+
+.. code-block::
+
+  - Post:
+    URL: `http://<config-service-name-or-ip>:<port>/device-group/<group-name>`
+    Ex: `http://config5g:8080/device-group/iot-camera`
+
+    Request Body:
+    {
+        "imsis":
+        [
+            "123456789123456"
+            "123456789123457"
+            "123456789123458"
+        ],
+        "site-info": "menlo",
+        "ip-domain-name": "pool1",
+        "ip-domain-expanded":
+        {
+            "dnn": "internet",
+            "ue-ip-pool": "10.91.0.0/16",
+            "dns-primary": "8.8.8.8",
+            "dns-secondary": "8.8.4.4",
+            "mtu": 1460,
+            "ue-dnn-qos":
+            {
+                "dnn-mbr-uplink": 4000000,
+                "dnn-mbr-downlink": 20000000,
+                "bitrate-unit": "Mbps",
+                "traffic-class": "platinum"
+            }
+        }
+    }
+
+  - Delete
+    URL: `http://<config-service-name-or-ip>:<port>/device-group/<group-name>`
+    Ex: `http://config5g:8080/device-group/iot-camera`
+
+Network Slice Configuration through REST Interface
+""""""""""""""""""""""""""""""""""""""""""""""""""
+
+.. code-block::
+
+  - Post:
+    URL: `http://<config-service-name-or-ip>:<port>/network-slice/<slice-name>`
+    Ex: `http://config5g:8080/network-slice/slice1`
+
+
+    Request Body:
+    {
+        "slice-id":
+        {
+            "sst": "1",
+            "sd": "010203"
+        },
+        "qos":
+        {
+            "uplink": 4000000,
+            "downlink": 20000000,
+            "bitrate-unit": "Mbps",
+            "traffic-class": "platinum"
+        },
+        "site-device-group":
+        [
+            "iot-camera"
+        ],
+        "site-info":
+        {
+            "site-name": "menlo",
+            "plmn":
+            {
+                "mcc": "315",
+                "mnc": "010"
+            },
+            "gNodeBs":
+            [
+                {
+                "name": "menlo-gnb1",
+                "tac": 1
+                }
+            ],
+            "upf":
+            {
+            "upf-name": "upf.menlo.aetherproject.org",
+            "upf-port": 8805
+            }
+        },
+    }
+
+  - Delete
+    URL: `http://<config-service-name-or-ip>:<port>/network-slice/<slice-name>`
+    Ex: `http://config5g:8080/network-slice/slice1`
+
+