Update README and .gitignore

Author: tatsuya6502

.gitignore

@@ -1,10 +1,3 @@
-# Generated by Cargo
-# will have compiled files and executables
 /target/
-
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
-# These are backup files generated by rustfmt
 **/*.rs.bk
+**/*~

README.md

@@ -1,2 +1,5 @@
-# atcoder-rust-base
+<!-- -*- coding:utf-8-unix -*- -->
+
+# AtCoder Rust Base
+
 A Cargo package template for AtCoder competitions / AtCoder競技向けのCargoパッケージテンプレート