Update README.md: Fixed spelling, grammar and general written mistakes.

[euangoodbrand]

Nothing technical has changed; I am just correcting minor errors.

Corrected spelling errors and improved clarity:

1. Corrected typos: "github" to "GitHub", "codes" to "code", "complaning" to "complaining", "resuability" to "reusability", "orginal" to "original", "remaining" to "remain", "signifiant" to "significant", "implmentations" to "implementations", "fouierkan" to "fourierkan", "learning focus" to "learning-focused", "out-of-the box" to "out-of-the-box", and "necessariy" to "necessarily".

2. Corrected grammatical errors and improved clarity:

   • Reworded "In case the scale of your task is large" to "If the scale of your task is large".
   • Rephrased "which is way beyond my expectation" to "which is far beyond my expectation".
   • Rephrased "I have" to "I have had".
   • Rephrased "So, I accept any criticism" to "I welcome any criticism".
   • Reworded "soI'm honored" to "so I'm honored".
   • Corrected the closing parentheses of "but" to "but ".
   • Corrected punctuation around the phrase "Practice is the only criterion for testing understanding".
   • I added parenthesis at the end of the author note needed after smiley face, which I assume was confused by the ending parenthesis.

Improved readability and coherence:

1. Added missing punctuation where needed for clarity.

There are more changes, which you can see from the file differences.