Adds Captcha Code Generator (Interactive UI)

[Atharv-110]

Resolves issue number: #43

List of Changes:

• Bug resolved in the main index.html.
• All the files for the captcha code generator have been added and also linked to the main index.html of WEBTOOLS.

Please Review and merge this PR under Hacktoberfest 2022 and add the tags related to it.

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[Priyanshu85]

Looks Nice @Atharv-110