add example config

example-config.json

@@ -0,0 +1,41 @@
+{
+    "database":
+    {
+        "type":"cassandra",
+        "cassandra":
+        {
+            "contact_points":"127.0.0.1",
+            "port":9042,
+            "keyspace":"clio",
+            "table_prefix":"",
+            "max_requests_outstanding":25000,
+            "threads":8
+        },
+        "postgres": {
+            "username":"postgres",
+            "password":"postgres",
+            "contact_point":"127.0.0.1",
+            "database":"clio"
+        }
+    },
+    "etl_sources":
+    [
+        {
+            "ip":"127.0.0.1",
+            "ws_port":"6005",
+            "grpc_port":"50051"
+        }
+    ],
+    "dos_guard":
+    {
+        "whitelist":["127.0.0.1"]
+    },
+    "server":{
+        "ip":"0.0.0.0",
+        "port":8080
+    },
+    "log_level":"debug",
+    "online_delete":0,
+    "extractor_threads":8,
+    "read_only":false
+}