Add some code examples

[JulianGCalderon]

Adds some code examples to the Concrete book, regarding basic language features.

I've not added documentation on these topics:

• Traits (not in main yet).
• Modules (or standard library).
• Attributes:
  • intrinsic.
  • lang_item.
• Borrowing rules for references.
• Union (low-level, is it worth to document?).

Also, our for implementation is pretty flexible (Go-like), allowing something like this:

for (; x <= 10; x = x + 1) {
    ...
}

I've not documented as I didn't know if we would keep it.

NOTE: Is there a way to preview the book before merging?

[github-actions]

Benchmarking (Linux) factorial

Compiling factorial (factorial.con)
Finished release in 32.804469ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 96.73 ms
Rust Result = 2432902008176640000 Time taken : 60.47 ms

Benchmarking (Linux) fib

Compiling fib (fib.con)
Finished release in 26.302977ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 136.76 ms
Rust Result = 6765 Time taken : 85.65 ms

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.29%. Comparing base (4802a28) to head (af0e219).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #226   +/-   ##
=======================================
  Coverage   56.29%   56.29%           
=======================================
  Files          25       25           
  Lines        5516     5516           
=======================================
  Hits         3105     3105           
  Misses       2411     2411           

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[github-actions]

Benchmarking (macOS) factorial

Compiling factorial (factorial.con)
Finished release in 595.531209ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 29.88 ms
Rust Result = 2432902008176640000 Time taken : 23.50 ms

Benchmarking (macOS) fib

Compiling fib (fib.con)
Finished release in 112.456458ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 92.74 ms
Rust Result = 6765 Time taken : 101.80 ms

[edg-l]

You cab preview the book locally with make book

[JulianGCalderon]

You cab preview the book locally with make book

Thanks @edg-l! I previewed the book locally and looks fine