lib Folder to sp1 Template

[0xVikasRushi]

I’ve been working with the sp1 template and noticed that managing shared code between program, and script is challenging. I’ve had to copy and paste code frequently, which is inefficient. it would be helpful if you add a lib for common rust code.

currently my folder structure looks something like these

bitcoin-spv/
├── lib/
│   ├── Cargo.toml
│   └── src/
│       └── lib.rs
├── program/
│   ├── Cargo.toml
│   └── src/
│       └── main.rs
├── script/
│   ├── Cargo.toml
│   └── src/
│       ├── bin/
│           ├── prove.rs
│           └── vkey.rs
└── rust-toolchain

[ctian1]

Added in #24!