update README and add travis

.travis.yml

@@ -0,0 +1,14 @@
+language: node_js
+
+node_js:
+  - 10
+
+cache:
+  directories:
+    - 'node_modules'
+
+install:
+  - npm install
+
+script:
+  - npm test

README.md

@@ -1,4 +1,36 @@
 # rrweb-snapshot
 
+[![Build Status](https://travis-ci.org/rrweb-io/rrweb-snapshot.svg?branch=master)](https://travis-ci.org/rrweb-io/rrweb-snapshot)
+
 Snapshot the DOM into a stateful and serializable data structure.
 Also provide the ability to rebuild the DOM via snapshot.
+
+## API
+
+This module export 3 methods:
+
+### snapshot
+
+`snapshot` will traverse the DOM and return a stateful and serializable data structure which can represent the current DOM **view**.
+
+There are serveral things will be done during snapshot:
+
+1. Inline some DOM states into HTML attributes, e.g, HTMLInputElement's value.
+2. Turn script tags into noscript tags to avoid scripts being executed.
+3. Try to inline stylesheets to make sure local stylesheets can be used.
+4. Make relative paths in href, src, css to be absolute paths.
+5. Give a id to each Node, and return the id node map when snapshot finished.
+
+#### rebuild
+
+`rebuild` will build the DOM according to the taken snapshot.
+
+There are serveral things will be done during rebuild:
+
+1. Add data-rrid attribute if Node is an Element.
+2. Create some extra DOM node like text node to place inline css and some states.
+3. Add data-extra-child-index attribute if Node has some extra child DOM.
+
+#### serializeNodeWithId
+
+`serializeNodeWithId` can serialize a node into snapshot format with id.

test/integration.ts

@@ -71,7 +71,6 @@ describe('integration tests', () => {
     this.server = await server();
     this.browser = await puppeteer.launch({
       // headless: false,
-      executablePath: '/home/yanzhen/Desktop/chrome-linux/chrome',
     });
 
     const bundle = await rollup.rollup({