Add well-known for matrix federation

https://github.com/spantaleev/matrix-docker-ansible-deploy/blob/master/docs/configuring-well-known.md#configuring-service-discovery-via-well-known

.well-known/matrix/client

@@ -0,0 +1,24 @@
+{
+    "im.vector.riot.e2ee": {
+        "default": true
+    },
+    "io.element.e2ee": {
+        "default": true,
+        "secure_backup_required": false,
+        "secure_backup_setup_methods": []
+    },
+    "m.homeserver": {
+        "base_url": "https://matrix.pub.solar"
+    },
+    "m.identity_server": {
+        "base_url": "https://matrix.pub.solar"
+    },
+    "m.integrations": {
+        "managers": [
+            {
+                "api_url": "https://dimension.pub.solar/api/v1/scalar",
+                "ui_url": "https://dimension.pub.solar/element"
+            }
+        ]
+    }
+}

.well-known/matrix/server

@@ -0,0 +1,3 @@
+{
+    "m.server": "matrix.pub.solar:8448"
+}