[Minor] Add authors and contributors document

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+# Project Authors and Contributors
+
+Rspamd was created by [Vsevolod Stakhov](https://github.com/vstakov) while working in [Rambler Mail](https://mail.rambler.ru/)
+
+## Authors
+
+* [Vsevolod Stakhov](https://github.com/vstakov)
+
+## Developers
+
+* [Mikhail Galanin](https://github.com/negram)
+* [Alexander Moisseev](https://github.com/moisseev)
+
+## Alumni Developers
+
+* [Andrew Lewis](https://github.com/fatalbanana)
+
+## Significant contributors
+
+* [Steve Freegard](https://github.com/smfreegard)
+* [Alexey Savelyev](https://github.com/AlexeySa)
+* [Anna Stakhova](https://github.com/AnnaStakhova)
+
+<https://github.com/rspamd/rspamd/graphs/contributors>
+
+## Special thanks to
+
+* [Mimecast](https://mimecast.com)
+* [Rambler Mail](https://mail.rambler.ru/)
+* [Locaweb](https://locaweb.com.br)
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