docs: add useful-materials

Author: Misaka-L

docs/useful-materials.md

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+# Some useful materials
+
+- Many A320 Technical Notes & Guide Provided by [AviationHunt](https://www.aviationhunt.com/): https://www.aviationhunt.com/a320-guide/
+- FCOM or AMM
+
+## ATA 23: Communication System
+
+- Technical Notes Provided By [AviationHunt](https://www.aviationhunt.com/): https://www.aviationhunt.com/airbus-a320-ata-23/
+
+### DRAIMS
+
+- Usage of DRAIMS & UI: https://www.youtube.com/watch?v=pASMNCvqwdY
+
+## ATA 31: Indicating and Recording Systems
+
+- Technical Notes Provided By [AviationHunt](https://www.aviationhunt.com/): https://www.aviationhunt.com/airbus-a320-ata-31/
+
+### Electrical Clock
+
+- Usage & Setting of the clock: https://www.youtube.com/watch?v=xczl6YiLRl0
+
+## ATA 33: Lighting System
+
+- Technical Notes Provided By [AviationHunt](https://www.aviationhunt.com/) : https://www.aviationhunt.com/airbus-a320-ata-33/
+
+### Exterior Lighting
+
+- A320 Exterior Lighting Compare with B737: https://www.youtube.com/watch?v=apiD-YMJnoY
+
+## ATA 34: Navigation Systems
+
+- Technical Notes Provided By [AviationHunt](https://www.aviationhunt.com/): https://www.aviationhunt.com/airbus-a320-ata-34/