Add client-side settings for Prism Launcher

prism/patches/org.multimc.custom.fakeonline.json

@@ -0,0 +1,23 @@
+{
+    "+agents": [
+        {
+            "downloads": {
+                "artifact": {
+                    "path": "custom/agents/authlib-injector-1.2.5.jar",
+                    "sha1": "1eca6aa7faf7ac6e3211862afa6e43fe2eedd07b",
+                    "size": 341970,
+                    "url": "https://github.com/yushijinhun/authlib-injector/releases/download/v1.2.5/authlib-injector-1.2.5.jar"
+                }
+            },
+            "name": "custom.agents:authlib-injector-1.2.5:1",
+            "argument": "http://127.0.0.1:25564"
+        }
+    ],
+    "+jvmArgs": [
+        "-DsocksProxyHost=127.0.0.1",
+        "-DsocksProxyPort=25560"
+    ],
+    "formatVersion": 1,
+    "name": "Fake online mode",
+    "uid": "org.multimc.custom.fakeonline"
+}