添加readme

.npmignore

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+/node_modules
+/src
+/package-lock.json

README.md

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+# FAVICON-TRAP
+
+A util allows you get favicons from a url
+
+using this util you can get all favicons from given url.
+
+# Installation
+```
+npm install favicon-trap
+```
+
+# Usage
+
+there is only one function, it's verry easilly!
+
+you can find more information from `.d.ts` file
+
+```typescript
+import { favicon } from 'favicon-trap'
+
+favicon('/path/to/url', option).then(icons=>console.log(icons))
+```
+
+
+# Option
+
+* **types**: which types of icons you want, "icon"、"apple-touch-icon"， default: ['icon']
+
+* **timeout**: http request timeout (unit:ms), default: 5000
+
+* **headers**: headers of http request