add PSL catalog file

PSL_catalog.json

@@ -0,0 +1,34 @@
+{
+    "name": "OG-UK",
+    "img": "https://raw.githubusercontent.com/PSLmodels/OG-UK/main/docs/OG-UK_logo.png",
+    "banner_title": "OG-UK",
+    "banner_subtitle": "Large-scale open source overlapping generations model of UK fiscal policy",
+    "detailed_description": "https://raw.githubusercontent.com/PSLmodels/OG-UK/main/README.md",
+    "policy_area": "Policy analysis, policy reform, fiscal policy, tax, benefits, social security, public finance, macroeconomic analysis, general equilibrium, dynamic scoring, overlapping generations, OG, OLG",
+    "geography": "USA",
+    "language": "Python",
+    "maintainers": [
+        {
+            "name": "Richard W. Evans",
+            "image": "https://github.com/rickecon.png",
+            "link": "https://github.com/rickecon"
+        },
+        {
+            "name": "Jason DeBacker",
+            "image": "https://github.com/jdebacker.png",
+            "link": "https://github.com/jdebacker"
+        },
+        {
+            "name": "Jon Pycroft",
+            "image": "https://avatars.githubusercontent.com/u/65815956?v=4",
+            "link": "https://github.com/jpycroft/"
+        }
+    ],
+    "links": {
+      "code_repository": "https://github.com/PSLmodels/OG-UK",
+      "user_documentation": "https://pslmodels.github.io/OG-UK",
+      "contributor_documentation": "https://pslmodels.github.io/OG-UK/content/contributing/contributor_guide.html",
+      "webapp": "",
+      "recent_changes": "https://github.com/PSLmodels/OG-UK/blob/main/CHANGELOG.md"
+    }
+}