Update README.md

challenges/forensics/Hidden Message/README.md

@@ -4,14 +4,14 @@ Can you find the hidden message within this beautiful image?
 ## Summary
  - **Author:** Valerie Lim
  - **Discord Username:** hisumirosa
- - **Category:** Cryptography
+ - **Category:** Forensics
  - **Difficulty:** Easy
 
 ## Hints
 None
 
 ## Files
-
+hidden_message.png (download the file given)
 
 ## Flag
 HEX{Y0UR_F1RST_TR1AL}