First commit
Added everything to git
Makefile: normalized
*: (sub)section vertical spacing

* three blank lines before sections
* two blank lines before subsections
*: physical unit conventions

Space character between number and physical unit.
*: removed unnecessary indents
Basics/Units/*: increased verbosity
Basics/Functions/*: increased verbosity
Basics/Derivatives/Definition: rewrote
Basics/Derivatives/Second derivative: rewrote
Basics/Derivatives/Formal derivation: add
Basics/Derivatives/Derivation rules: rewrote