feat(nex-servers): add nex token get stub and start working on grpc server

src/nnid/provider.rs

@@ -0,0 +1,20 @@
+use std::net::Ipv4Addr;
+use std::str::FromStr;
+use rocket::get;
+use serde::Serialize;
+use crate::xml::Xml;
+
+#[derive(Serialize)]
+#[serde(rename = "nex_token")]
+struct NexToken{
+    host: Ipv4Addr,
+    nex_password: String,
+    pid: i32,
+    port: u16,
+    token: String
+}
+
+#[get("/v1/api/provider/nex_token/@me?<game_server_id>")]
+pub async fn get_nex_token(game_server_id: String) -> Option<Xml<NexToken>>{
+    None
+}