A hybrid post quantum cryptography scheme using EdDSA (ed25519) + Falcon

This is a proof of concept implementation that combines a classical and post quantum digital signature scheme. NIST Round 3 implementation of Falcon and EdDSA (ed25519) implementation from https://tweetnacl.cr.yp.to/ is used.

This hybrid implementation is a short term hedge against known lattice based cryptography schemes getting broken.