add problem statement

Author: VoidMercy

forensics/flag-peg-150-points.md

@@ -1,6 +1,10 @@
 # Flag PEG - 150 Points
 
-#### phsst - VoidMercy's writeup
+We found a flag but it didn't do anything. Maybe you can find a better [flag](https://raw.githubusercontent.com/EasyCTF/easyctf-2017-problems/master/flag-peg/heresaflag.jpg)?
+
+### Solution
+
+###### Writeup by VoidMercy from phsst
 
 We were given a .jpg file.