Add configuration

Cargo.lock

@@ -216,7 +216,9 @@ dependencies = [
  "log",
  "minecraft-protocol",
  "pretty_env_logger",
+ "serde",
  "tokio",
+ "toml",
 ]
 
 [[package]]
@@ -611,6 +613,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"