CONTRIBUTORS.md を追加

CONTRIBUTORS.md

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+Tokyo Covid-19 response site contributors
+============================================
+
+本サイトにご協力いただいた皆様
+
+| Name(link) | Contribution |
+| --- | --- | 
+|[Hal Seki(Code for Japan)](https://github.com/halsk) | Project facilitation |
+|[Yu Uno(Cookpad Inc.)](https://twitter.com/saladdays) | UI/UX Design |
+|[Kenshiro Fujii(Cookpad Inc.)](https://twitter.com/kenshir0f) | UI Design / Frontend |
+|[Kazuki Imamura(Code for CAT)](https://code4cat.org/) | Coding |
+|[mikkame](https://github.com/mikkame) | Backend |
+|[Hiroaki Ishii](https://twitter.com/hiroishi0422) | Translation |
+|[osoken](https://github.com/osoken) | Coding |
+|[yokinist](https://github.com/yokinist) | Frontend |
+|[Hiroki Komamiya(Yahoo Japan Corp)](https://github.com/hkomamiy) | Data Visualization(Design) / Coding |
+|[Yuichi Nakamura（Yahoo! JAPAN Corp.）](https://twitter.com/sonatax) | Frontend |
+|Akane Suzuki | Translation |
+|[ocean3fish（Code for YOKOHAMA）](https://twitter.com/Shishamous) | Data Steward |
+|[Hayashi Noriko（Code for INZAI / Iinfosign, Inc.）](https://twitter.com/forestgtree) | Flow page Design |
+|[potato4d / Takuma HANATANI (LINE / ElevenBack LLC.)](https://twitter.com/potato4d)| Frontend / OSS Community Triage |
+|[daitasu(Code for Japan / STORES.jp)](https://twitter.com/daitasu)| Frontend |
+| -add your name here!- | -what did you do?- |
+
+ご協力に感謝です！！！
+
+![nyan](https://i.gyazo.com/f04e7468ea6e4bb6e87f6817fea980f9.gif)