setup page for errate

Author: rasbt

docs/errata/README.md

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+Dear Readers, 
+
+again, I tried my best to cut all the little typos, errors, and formatting bugs that slipped through the copy editing stage. Even so, while I think it is just human to have a little typo here and there, I know that this can be quite annoying as a reader!
+
+As an incentive to get in touch in case you find errors in the books, I will donate $5 to [UNICEF USA](https://www.unicefusa.org), the US branch of the United Nations agency for raising funds to provide emergency food and healthcare for children in developing countries, for each little unreported buglet you find!
+
+Also below, I added a small leaderboard to keep track of the errata submissions and errors you found. Please let me know if you don't want to be explicitely mentioned in that list! 
+
+
+- Amount for the next donation: 5$
+- Amount donated: 0$
+
+
+---
+
+
+Contributor list:
+
+
+1. Gogy ($5)
+
+
+<br>
+<br>
+<br>
+<br>
+
+
+
+
+
+---
+
+### Errata
+
+![](./images/pg55.png)