Create image-metadata.md

Author: jAniceto

general/image-metadata.md

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+# Editing photos metadata
+
+You can do it in one line in the Terminal using `jhead`.
+
+For example, adjust all EXIF times forward by 1 hour:
+```
+jhead -ta+1:00 *.jpg
+```
+
+Useful links: 
+
+[jhead download page](http://www.sentex.net/~mwandel/jhead/)
+
+[jhead documentation](http://www.sentex.net/~mwandel/jhead/usage.html)