Add JSON to sample files

sample_files/modified.json

@@ -0,0 +1,5 @@
+{
+  "foo": [2, 3, 4, 5],
+  "zab": "testing",
+  "woo": ["foobar"]
+}

sample_files/original.json

@@ -0,0 +1,4 @@
+{
+  "foo": [1, 2, 3, 4],
+  "bar": "testing"
+}