Added SharePoint community adapter

Author: SuperDJ

README.md

@@ -96,6 +96,7 @@ Want to get started quickly? Check out some of these integrations:
 * Redis (through Predis): https://github.com/danhunsaker/flysystem-redis
 * Selectel Cloud Storage: https://github.com/ArgentCrusade/flysystem-selectel
 * SinaAppEngine Storage: https://github.com/litp/flysystem-sae-storage
+* SharePoint https://gitlab.com/cadix/flysystem-sharepoint-adapter
 * PDO Database (optimised for use with large files when using the streams): https://github.com/phlib/flysystem-pdo
 * PDO Database: https://github.com/IntegralSoftware/flysystem-pdo-adapter
 * SSH/Shell: https://github.com/oliwierptak/flysystem-ssh-shell