Add example data.

example.json

@@ -0,0 +1,19 @@
+{ "members": [
+    {"name": "Alice", "gender": "f"},
+    {"name": "Bob", "gender": "m"},
+    {"name": "Sam", "gender": "o"},
+    {"name": "Eve", "gender": "f"},
+    {"name": "Charles", "gender": "m"},
+    {"name": "Max", "gender": "o"}
+  ],
+
+  "relationships": [
+    ["Sam", "Max", "solid"],
+    ["Sam", "Eve", "solid"],
+    ["Max", "Eve", "solid"],
+    ["Sam", "Bob", "solid"],
+    ["Alice", "Bob", "dashed"],
+    ["Alice", "Charles", "solid"],
+    ["Charles", "Max", "dashed"]
+  ]
+}