update README

README.md

-# mdbook Pages template
-
-An mdbook template for GitLab pages. This template automatically builds your mdbook with CI/CD using the following `.gitlab-ci.yml`:
+# mdbook Pages for MOKIT Doc
 
+## Usage
 ```
-pages:
-  stage: deploy
-  script:
-  - wget https://github.com/badboy/mdbook-toc/releases/download/0.2.4/mdbook-toc-0.2.4-x86_64-unknown-linux-gnu.tar.gz
-  - wget https://github.com/rust-lang/mdBook/releases/download/v0.3.7/mdbook-v0.3.7-x86_64-unknown-linux-gnu.tar.gz
-  - tar xvzf mdbook-v0.3.7-x86_64-unknown-linux-gnu.tar.gz
-  - tar xvzf mdbook-toc-0.2.4-x86_64-unknown-linux-gnu.tar.gz
-  - ./mdbook build
-  artifacts:
-    paths:
-    - public
-  only:
-  - master
+tar xzvf mdbook-toc*.tar.gz
+tar xzvf mdbook-v*.tar.gz
+# modify md in src
+./mdbook build
+./mdbook serve
+# open your browser to visit http://localhost:3000
 ```
 
 ## Features