docs(quick-start): add quick start

#166

website/docs/getting-started/quick-start.md

@@ -0,0 +1,32 @@
+# Quick Start
+
+After you have installed `Rudus` you can now create a new TypeScript _(or JavaScript)_ file inside your repo, call it `parser.ts` for example and copy the example below into it:
+
+```ts
+import { string, sequenceOf, whitespace } from "rudus";
+
+const parser = sequenceOf([string("Hello"), whitespace(), string("World")]);
+
+const parserResult = parser.run("Hello World");
+
+console.log(parserResult);
+```
+
+And then run that file via [`ts-node`](https://typestrong.org/ts-node/):
+
+```bash
+npx ts-node parser.ts
+```
+
+In your console you should see an output like this:
+
+```json
+{
+  "input": "Hello World",
+  "isError": false,
+  "offset": 11,
+  "result": ["Hello", " ", "World"]
+}
+```
+
+Congratulations! You have just made and run your first parser which is able to parse the string `"Hello World"` with `Rudus`.