Updates README.md

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Author: mzhang28

README.md

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 # EasyCTF 2017 Writeups
 
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+Thanks for participating in EasyCTF! We had a great time running the competition, so we hope that you had a great time participating as well. In this web book, you will find the solutions to problems that appeared during the competition. If you would like to submit a writeup to a problem you solved, see the instructions below about **Contributing**.
 
 ## Contributing
 
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 **To submit your writeup link, fork **[**this repository**](https://github.com/EasyCTF/easyctf-2017-writeups)**, add your link, and submit a pull request; an organizer will review it shortly. Please follow the format of existing problems.**
 
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