Merge branch 'add_missing_protocol_template' into 'master'

Add simple_digit_recognition protocol template

See merge request !31

advanced/protocoltemplates/simple_digit_recognition/1.json

+{
+    "schema_version": 1,
+    "sets": [
+        {
+            "name": "train",
+            "outputs": {
+                "id": "{{ system_user.username }}/uint64/1",
+                "class_id": "{{ system_user.username }}/uint64/1",
+                "image": "{{ system_user.username }}/array_2d_uint8/1"
+            }
+        },
+        {
+            "name": "test",
+            "outputs": {
+                "id": "{{ system_user.username }}/uint64/1",
+                "class_id": "{{ system_user.username }}/uint64/1",
+                "image": "{{ system_user.username }}/array_2d_uint8/1"
+            }
+        }
+    ]
+}
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