add Snippet demonstrating encoding arrays

Author: tayloraswift

Snippets/EncodingArrays.swift

@@ -0,0 +1,11 @@
+import JSON
+
+let json:JSON = .array
+{
+    for i:Int in 0 ... 3
+    {
+        $0[+] = [_].init(0 ... i)
+    }
+}
+
+print(json)