Documentation: add Nitrokey to distributions

Nitrokey offers various products, which have coreboot pre-installed.

Change-Id: I3ef25e0e1cb97eda5fd457bdb650f3ee3f00210a
Signed-off-by: Markus Meissner <coder@safemailbox.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78299
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Documentation/distributions.md b/Documentation/distributions.md
index 139e5b6..219c659 100644
--- a/Documentation/distributions.md
+++ b/Documentation/distributions.md
@@ -8,6 +8,16 @@
 
 ## Hardware shipping with coreboot
 
+### Nitrokey
+
+[Nitrokey](https://nitrokey.com) is a german IT security hardware vendor which
+offers a range of laptops, PCs, HSMs, and networking devices with coreboot and
+[Dasharo](https://dasharo.com/). The devices come with neutralized Intel
+Management Engine (ME) and with pre-installed [Heads](http://osresearch.net) or
+EDK2 payload providing measured boot and verified boot protection. For
+additional security the systems can be physically sealed and pictures of those
+sealings are sent via encrypted email.
+
 ### NovaCustom laptops
 
 [NovaCustom](https://configurelaptop.eu/) sells configurable laptops with