test: extend test suite with benchmarks and capture results in documentation (#93)

Closes #92

Signed-off-by: purpleclay <purpleclaygh@gmail.com>

Author: purpleclay

README.md

@@ -79,12 +79,7 @@ Real-world parser examples:
 - [GPG Private Key Parser](examples/gpg/main.go) - Parse GPG key metadata
 - [Git Diff Parser](examples/git-diff/main.go) - Parse unified diff output
 
-## Combinator Reference
+## Documentation
 
-See the full [Combinator Reference](docs/combinators.md) for all available combinators:
-
-- **Character**: `Char`, `AnyChar`, `OneOf`, `NoneOf`, `Any`, `Not`, `Take`
-- **Tags**: `Tag`, `TagNoCase`, `Until`, `TakeUntil1`
-- **Sequences**: `Pair`, `All`, `First`, `Many`, `Repeat`, `Delimited`
-- **Predicates**: `While`, `WhileN`, `WhileNot`, `Alpha`, `Digit`, `Space`
-- **Modifiers**: `Map`, `Opt`, `Peek`, `Flatten`, `Escaped`
+- [Combinator Reference](docs/combinators.md) - All available combinators
+- [Benchmarks](docs/benchmarks.md) - Performance benchmarks