add data source for psql

data/psql.json

@@ -0,0 +1,15 @@
+{
+  "description": "This invokes the default pager, which is likely to be 'less', other functions may apply.",
+  "functions": {
+    "shell": [
+      {
+        "code": "psql\n\\?\n!/bin/sh\n"
+      }
+    ],
+    "sudo": [
+      {
+        "code": "psql\n\\?\n!/bin/sh\n"
+      }
+    ]
+  }
+}