Create graphicsmagick.json

Author: wang-q

packages/graphicsmagick.json

@@ -0,0 +1,16 @@
+{
+  "name": "graphicsmagick",
+  "version": "1.3.45",
+  "description": "Image processing library",
+  "homepage": "http://www.graphicsmagick.org/",
+  "license": "MIT",
+  "type": "vcpkg",
+  "tests": [
+    {
+      "name": "version",
+      "command": "gm",
+      "pattern": "GraphicsMagick [0-9]+\\.",
+      "args": "version"
+    }
+  ]
+}