snippets: add a basic snippet

package.json

@@ -49,8 +49,8 @@
     ],
     "snippets": [
       {
-        "language": "javascript",
-        "path": "./snippets/goal-snippets.json"
+        "language": "opengoal",
+        "path": "./snippets/opengoal.json"
       }
     ]
   }

snippets/opengoal.json

@@ -0,0 +1,11 @@
+{
+	"defun": {
+		"prefix": "defun",
+		"body": [
+			"(defun ${1:name} (${2:vars})",
+			"\t\"${3:doc-string}\"",
+			"\t$0)"
+		],
+		"description": "Create a new function"
+	}
+}