Update README.md.

README.md

@@ -1,2 +1,44 @@
 # mime-types
+
+[![npm version](https://img.shields.io/npm/v/@litert/mime-types.svg?colorB=brightgreen)](https://www.npmjs.com/package/@litert/mime-types "Stable Version")
+[![npm version](https://img.shields.io/npm/v/@litert/mime-types/dev.svg)](https://www.npmjs.com/package/@litert/mime-types "Development Version")
+[![License](https://img.shields.io/github/license/litert/mime-types.svg)](https://github.com/litert/mime-types/blob/master/LICENSE)
+[![node](https://img.shields.io/node/v/@litert/mime-types.svg?colorB=brightgreen)](https://nodejs.org/dist/latest-v10.x/)
+[![GitHub issues](https://img.shields.io/github/issues/litert/mime-types.svg)](https://github.com/litert/mime-types/issues)
+[![GitHub Releases](https://img.shields.io/github/release/litert/mime-types.svg)](https://github.com/litert/mime-types/releases "Stable Release")
+[![GitHub Pre-Releases](https://img.shields.io/github/release/litert/mime-types/all.svg)](https://github.com/litert/mime-types/releases "Pre-Release")
+
 Get MIME type based on file name.
+
+## Installation
+
+In the Node.js environment, you can install directly using NPM:
+
+```sh
+$ npm i @litert/mime-types --save
+```
+
+Or install the developing (unstable) version for newest features:
+
+```sh
+$ npm i @litert/mime-types@dev --save
+```
+
+## API
+
+Demo code is written using TypeScript.
+
+```typescript
+import * as mime from "@litert/mime-types";
+
+mime.get("hello.json");         // application/json
+mime.get(".html");              // text/html
+mime.get("css");                // text/css
+mime.get("hi/baby.js");         // application/javascript
+mime.get("/root/down/pk.zip");  // application/zip
+mime.get("ext.dodooh");         // application/octet-stream
+```
+
+## License
+
+This library is published under [Apache-2.0](./LICENSE) license.

sources/index.ts

@@ -2,5 +2,5 @@ let extJson = require(__dirname + "/../mime.json");
 
 export function get(fpath: string): string {
     let ext = fpath.indexOf(".") === -1 ? fpath : fpath.slice(fpath.lastIndexOf(".") + 1);
-    return extJson[ext] || "application/octet-stream";
+    return extJson[ext.toLowerCase()] || "application/octet-stream";
 }