docs: add links to CodeIgniter

[kenjis]

Issue	#369
🪲 Bug Fix	No
🏆 Feature	No
📝 Refactor	No
📖 Documentation	Yes
⚠️ Break Change	No

Description

• add links to CodeIgniter preset

[codecov]

Codecov Report

Merging #374 (0372d4e) into master (56537fd) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   94.65%   94.59%   -0.06%     
==========================================
  Files          70       70              
  Lines        3481     3481              
==========================================
- Hits         3295     3293       -2     
- Misses        149      152       +3     
+ Partials       37       36       -1     

Impacted Files	Coverage Δ
core/shell/shell.go	81.20% <0.00%> (-1.51%)	⬇️

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