Added star counter on github.io

Author: mwouts

README.md

@@ -4,6 +4,7 @@
 [![Build Status](https://travis-ci.com/mwouts/itables.svg?branch=master)](https://travis-ci.com/mwouts/itables)
 [![codecov.io](https://codecov.io/github/mwouts/itables/coverage.svg?branch=master)](https://codecov.io/github/mwouts/itables?branch=master)
 [![Binder](https://img.shields.io/badge/Binder-Notebook-blue.svg)](https://mybinder.org/v2/gh/mwouts/itables/master?filepath=README.md)
+<a class="github-button" href="https://github.com/mwouts/itables" data-icon="octicon-star" data-show-count="true" aria-label="Star mwouts/itables on GitHub">Star</a>
 
 
 Turn pandas DataFrames and Series into interactive [datatables](https://datatables.net) in both your notebooks and their HTML representation with a single additional import:
@@ -16,7 +17,7 @@ df = wb.get_countries()
 df
 ```
 
-You don't see any table above? Please either open the [HTML export](https://mwouts.github.io/itables/) of this notebook, or run this README on [![Binder](https://img.shields.io/badge/Binder-blue.svg)](https://mybinder.org/v2/gh/mwouts/itables/master?filepath=README.md)!
+You don't see any table above? Please either open the [HTML export](https://mwouts.github.io/itables/) of this notebook, or run this README on [Binder](https://mybinder.org/v2/gh/mwouts/itables/master?filepath=README.md)!
 
 
 # Quick start
@@ -207,3 +208,12 @@ If you are looking for a table component that will fit in Dash applications, see
 I think it would be very helpful to have an identical table component for both Jupyter and [Dash](http://dash.plot.ly/). Please [let us know](https://community.plot.ly/t/why-does-dash-have-its-own-datatable-library/) if you are interested in drafting a new table component based on an existing Javascript library for Dash.
 
 Also, if you happen to prefer another Javascript table library (say, [ag-grid](https://www.ag-grid.com/)), and you would like to see it supported in `itables`, please open either an issue or a PR, and let us know what is the minimal code to display a table in Jupyter using your library.
+
+# Appendix
+
+Below we initialize the github star button <a class="github-button" href="https://github.com/mwouts/itables" data-icon="octicon-star" data-show-count="true" aria-label="Star mwouts/itables on GitHub">Star</a> that appears on top of this notebook:
+
+```python
+%%HTML
+<script async defer src="https://buttons.github.io/buttons.js"></script>
+```