Add NIC definition to OpenIPC Glossary

Added definition for 'NIC' to the glossary.

Author: PaddyP90

src/content/docs/reference/OpenIPC-Glossary.md

@@ -141,3 +141,6 @@ description: Here is a glossary of terms related to OpenIPC
 
 - **Yaml-CLI**  
   A command-line interface tool used to change settings.
+- **NIC**
+   Network Interface Controller (also commonly called Network Interface Card).
+   It is the hardware component (either built into your device or an external adapter) that allows your computer, phone, laptop, or any device to connect to a Wi-Fi network.