Add information about design paper and anonbib inside README.1st
As mentioned under legacy/trac#33688 (moved) (comment 9) some old "TODO" items were removed from doc/HACKING/README.1st.md file.
Link and description should be added for:
- design paper,
- anonbib.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information