docs: optional profile in groupInvitation and x.grp.acpt (incognito connections) (#944)

docs/protocol/simplex-chat.schema.json

@@ -82,7 +82,7 @@
         "memberId": {"ref": "base64url"},
         "metadata": {
           "comment": "memberId must be present in all group message references, both for sent and received"
-        } 
+        }
       }
     },
     "fileInvitation": {
@@ -108,6 +108,12 @@
         "invitedMember": {"ref": "memberIdRole"},
         "connRequest": {"ref": "connReqUri"},
         "groupProfile": {"ref": "profile"}
+      },
+      "optionalProperties": {
+        "fromMemberProfile": {"ref": "profile"},
+        "metadata": {
+          "comment": "fromMemberProfile is user's custom profile to be used in the group - invitee should use this profile for the host's group member"
+        }
       }
     },
     "memberIdRole": {
@@ -156,7 +162,7 @@
         "rtcExtraInfo": {
           "properties": {
             "rtcIceCandidates": {"type": "string"}
-          }          
+          }
         }
       }
     },
@@ -210,7 +216,7 @@
             "profile": {"ref": "profile"}
           }
         }
-      }   
+      }
     },
     "x.info.probe": {
       "properties": {
@@ -317,6 +323,12 @@
         "params": {
           "properties": {
             "memberId": {"ref": "base64url"}
+          },
+          "optionalProperties": {
+            "memberProfile": {"ref": "profile"},
+            "metadata": {
+              "comment": "memberProfile is user's custom profile to be used in the group - host should use this profile for the invitee's group member"
+            }
           }
         }
       }