(server) Add a server written in Rust

Server/.gitignore

@@ -0,0 +1,7 @@
+/target
+
+# Though the `logs` folder will be created at the same directory
+# hierarchy of the executable (if you directly run the executable),
+# this folder, however, will be created at the root directory
+# of the project when running project by using `cargo run`.
+/logs