[FEATURE] Adding hello world template in PHP (Issue #185)

[antonioolf]

- What I did

• A Hello World template was added to create formulas in PHP ( Issue [FEATURE] Adding hello world template in PHP (rit create formula) #185 )

- How I did it

• I used as example the other existing templates and created an equivalent for PHP language, making the necessary adaptations.

- How to verify it

- Run "rit create formula"
- Enter the new formula command
- Choose PHP in the languages list
- go to the local repository folder
- run "make test-local"
- run the new created command

- Description for the changelog

• Added support for PHP language

[victor-schumacher]

LGTM!

[antonioolf]

Making some adjusts

[codecov-commenter]

Codecov Report

Merging #216 into master will increase coverage by 0.03%.
The diff coverage is 65.51%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
+ Coverage   60.24%   60.28%   +0.03%     
==========================================
  Files          75       75              
  Lines        2895     2923      +28     
==========================================
+ Hits         1744     1762      +18     
- Misses        898      903       +5     
- Partials      253      258       +5     

Impacted Files	Coverage Δ
pkg/formula/creator.go	78.91% <50.00%> (-0.40%)	⬇️
pkg/formula/lang.go	67.14% <66.66%> (-0.10%)	⬇️
pkg/cmd/create_formula.go	54.38% <100.00%> (ø)

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