Update README.md

README.md

@@ -1 +1,43 @@
 # koala
+
+### Whats's it?
+**koala** is a CLI that join separate files generating only one file as a bundler. Nowadays already exists others bundlers more complete like the [Webpack](https://github.com/webpack/webpack) but the idea of **koala** is to be most simple and generic.
+
+### Get started
+**koala** need that you input an entrypoint to itself work and the entrypoint is just a file that **koala** will be to read like a hub to call others files, follow the sample of one entry file named as `./entry.js`.
+```js
+'use strict';
+
+include lib/hello.js
+
+hello("Koala");
+```
+
+The entry file above is used to find out the targets that is just the line of entry file prefixed with a tag, see the example below where the tag is named as `include`.
+```js
+include lib/hello.js
+```
+Now look the external file at `./lib/hello` where the koala named it as library, follow the sample below.
+
+```js
+function hello(name) {
+  console.log(`Hello, ${name}`);
+}
+```
+Now look the output file at `./bin/out.js` and execute, this example execute the **koala** and [node.js](https://github.com/nodejs/node) together.
+```js
+'use strict';
+
+function hello(name) {
+  console.log(`Hello, ${name}`);
+}
+
+hello("Koala")
+```
+
+```sh
+> koala ./entry.js ./bin/out.js include && node ./bin/out.js
+
+2018/10/08 15:53:13 spelled successfully 104 bytes at /Users/user/remote/username/repo/bin/out.js
+Hello, Koala
+```