TODO.md

• Impelement features listed in stated goals, possible add them under issue and give proper description.
• PR to add ppar into https://github.com/rust-unofficial/awesome-rust.
• im and rpds are current alternative for ppar. Find more alternatives and possibly benchmark them.
• Add dependency graph to README.md.
• License validation.
• Rustdoc, md-doc spell checking and hyper-link sanity.
• Add concurrency performance benchmark under src/bin/perf.rs.