Add bitwarden to password managers

Add bitwarden to password managers

Add bitwarden

README.md

@@ -848,6 +848,7 @@ See https://github.com/n1trux/awesome-sysadmin#monitoring and https://github.com
 
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+ * [Bitwarden](https://bitwarden.com/) - Password manager with webapp, browser extension, and mobile app. ([Source Code](https://github.com/bitwarden/core)) `AGPLv3` `C#`
  * [keeweb](https://keeweb.info/) - This webapp is a browser and desktop password manager compatible with KeePass databases. ([Source Code](https://github.com/keeweb/keeweb)) `MIT` `HTML5`
  * [sysPass](http://www.syspass.org/) - Multiuser password management system. ([Demo](http://demo.syspass.org/), [Source Code](https://github.com/nuxsmin/sysPass)) `GPLv3` `PHP`
  * [Teampass](http://teampass.net/) - Password manager dedicated for managing passwords in a collaborative way on any server Apache, MySQL and PHP. ([Source Code](https://github.com/nilsteampassnet/TeamPass/)) `GPLv3` `PHP`