Add LDAP group sync

doc/ldap-group-sync.markdown

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+LDAP Group Synchronization
+==========================
+
+Requirements
+------------
+
+- Have LDAP authentication properly configured
+- Use a LDAP server that supports `memberOf`
+
+Automatically define Kanboard groups based on LDAP groups
+---------------------------------------------------------
+
+In your config file, define the constants `LDAP_GROUP_ADMIN_DN` and `LDAP_GROUP_PROJECT_ADMIN_DN`. Here an example, replace the values according to your own LDAP configuration:
+
+```php
+define('LDAP_GROUP_ADMIN_DN', 'CN=Kanboard Admins,CN=Users,DC=kanboard,DC=local');
+define('LDAP_GROUP_PROJECT_ADMIN_DN', 'CN=Kanboard Project Admins,CN=Users,DC=kanboard,DC=local');
+```
+
+- People member of "Kanboard Admins" will be "Kanboard Administrators"
+- People member of "Kanboard Project Admins" will be "Kanboard Project Administrators"
+- Everybody else will be Kanboard Standard Users
+
+Note: At the moment, that works only at account creation.
+
+Filter Kanboard access based on the LDAP group
+----------------------------------------------
+
+To allow only some users to use Kanboard, use the existing `LDAP_USER_PATTERN` constant:
+
+```php
+define('LDAP_USER_PATTERN', '(&(objectClass=user)(sAMAccountName=%s)(memberOf=CN=Kanboard Users,CN=Users,DC=kanboard,DC=local))');
+```
+
+This example allow only people member of the group "Kanboard Users" to connect to Kanboard.
+