Created FAQ (markdown)

FAQ.md

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+## How to add a *glue* record manually when your registrar is a dinosaur with no admin panel?
+If you purchased a domain with a registrar that doesn´t provide an option to edit *glue* records you need to manually add them to your mail-in-a-box instance. A glue record is simply an A record that points to your domain.
+
+Example:
+```
+example.com.                     IN      A
+ns1.box.example.com              IN      A
+ns2.box.example.com              IN      A
+
+ns1.box.example.com              IN      NS           ns1.box.example.com
+ns2.box.example.com              IN      NS           ns2.box.example.com
+
+```