Add 20T gas for add_participant API call

web-client/Cargo.toml

 [package]
 name = "web-client"
-version = "0.1.1"
+version = "0.1.2"
 edition = "2021"
 authors = ["silvestr@relayz.io"]
 description = """

web-client/src/contract.rs

             "meet_id": meet_id,
             "participant": participant
         }))
+        .gas(parse_gas!("20 T") as u64)
         .commit(Finality::None)
         .await?
         .id();