Learning holochain

Notes:

• Used version: nix-shell https://github.com/holochain/holonix/archive/0.0.29.tar.gz
• Enter nix-shell and make sure hc --version and the same as hdk version in Cargo.toml

Lesson:

• Read the release info of the dependencies
• do a search in holochain-rust sourcecode to find code snippets showing how to use things