feature/add-customized-margin: add customized bottom margin and documentation

README.md

@@ -183,6 +183,7 @@ Below are the props you can pass to the React Component.
 | searchMessage              | string    |         | searchMessage={'Some search message here'} | If you want to customize search message just use this prop.                                                                                                               |
 | lang                       | string    | 'en'    | lang={'pl'}                                | If you need to change the lang. just put one of supported lang. Or if you didn't find required lang just add them and make a PR :)                                        |
 | enableModalAvoiding        | boolean   | false   | enableModalAvoiding={true}                 | Is modal should avoid keyboard ? On android to work required to use with androidWindowSoftInputMode with value pan, by default android will avoid keyboard by itself      |
+| openKeyboardMargin        | number   | keyboardHeight   | openKeyboardMargin={50}                 | In case you have set enableModalAvoiding = {true} you can adjust how much you want the modal to rise above keyboard the default value for this will be the keyboard height itself      |
 | androidWindowSoftInputMode | string    |         | androidWindowSoftInputMode={'pan'}         | Basicaly android avoid keyboard by itself, if you want to use custom avoiding you may use this prop                                                                       |
 | itemTemplate               | ReactNode |    CountryButton     | itemTemplate={YourTemplateComponentsHere}  | This parameter gets a React Node element to render it as a template for each item of the list. These properties are sent to the item: key, item, style, name, and onPress |
 | style                      | Object    |         | style={{yoursStylesHere}}                  | If you want to change styles for component you probably need this props. You can check the styling part below.                                                            |