add documentation

Author: Arjun-sna

src/snackbar/readMe.md

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+## Button
+
+The base Snackbar component.
+
+### Properties
+| Name | Type | Default | Description |
+|:-----|:-----|:-----|:-----|
+| `children` | `Any` | `null` | All children components to be rendered inside the Snackbar |
+| `timeout` | `Number` | 2000 | Timeout to auto hide the snackbar |
+| `autoClose` | `Boolean` | true | Prop to decide whether the snackbar should close automatically after the given timeout or not |
+| `onClose` | `function` | null | The callback function to be called when the snackbar closes |
+| `position` | `String` | `bottom` | The position at which the snackbar should be show. The possible values are `top`, `bottom` |
+
+### Theme
+
+| Name     | Description|
+|:---------|:-----------|
+| `snackbar`   | Class used for the snackbar element.|
+| `snackbarWrapper` |  Class used for snackbar wrapper element |
+
+### Usage
+
+```
+  <div>
+    <Snackbar
+      active={this.state.showIndefiniteSnackbar}
+      onClose={this.handleSnackClose}
+      autoClose={false}>
+      <span>This is a indefinite snackbar.</span>
+    </Snackbar>
+  </div>
+```