Add metadata file.

meta/libraries.json

@@ -0,0 +1,18 @@
+{
+    "key": "iterator",
+    "name": "Iterator",
+    "authors": [
+        "Dave Abrahams",
+        "Jeremy Siek",
+        "Thomas Witt"
+    ],
+    "description": "The Boost Iterator Library contains two parts. The first is a system of concepts which extend the C++ standard iterator requirements. The second is a framework of components for building iterators based on these extended concepts and includes several useful iterator adaptors.",
+    "category": [
+        "Iterators"
+    ],
+    "maintainers": [
+        "David Abrahams <dave -at- boost-consulting.com>",
+        "Thomas Witt <witt - at - acm.org>",
+        "Jeffrey Lee Hellrung Jr. <jeffrey.hellrung -at- gmail.com>"
+    ]
+}