Add Dialog docs. Docs are finished

docs/methods/dialog.md

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+# Dialog
+
+A method to display an alert, or a dialog to save or open a file.
+
+```javascript
+import React, { Component } from 'react';
+
+import { render, Window, App, TextInput, Dialog } from './src/';
+
+class Example extends Component {
+  render() {
+    return (
+      <App>
+        <Window title="Example" height={500} width={500}>
+            <TextInput stretchy={false} onChanged={() => Dialog('Error', {title: "Message"})}/>
+        </Window>
+      </App>
+    );
+  }
+}
+
+render(<Example />);
+```
+
+## Arguments
+
+- [type](#type)
+- [options](#options)
+
+## Reference
+
+### type
+
+What type the dialog is. The current types are:
+
+- Message - a simple message
+- Error - an error message
+- Open - open a file
+- Save - save a file
+
+| **Type** | **Required** |
+| --- | --- |
+| enum('Message', 'Error', 'Open', 'Save') | Yes |
+
+### options
+
+Options for the title and description if it is a Message or Error.
+
+| **Type** | **Required** |
+| --- | --- |
+| {title: string, description: string} | One (if it is Message or Error) |