HOWTO_ADD_NEW.md

How to add a new glacier to the gallery

1. Resize you photo that the longer side (height or width) equals 400px (linux: convert -geometry 400x src/image1.png out/image1.png for 400px width, or convert -geometry x400 src/image1.png out/image1.png for 400px height, aspect ratio is conserved)
2. Add the resized photo to glacier_photos/
3. Add new entry in glacier_data.py (for img use https://raw.githubusercontent.com/OGGM/glacier-gallery/master/glacier_photos/NEW_GLACIER.jpg) and save file
4. execute the whole notebook for each language (currently en and de) and save clean version of notebook afterwards
5. commit, push, merge