Rewrote some parts of README.md and fixed typos

[vsharika1]

(5) "This repository contains pieces of code that I want to have, but don't deserve their own repository." -> "This repository is a collection of little snippets of code that are incomplete and too small to have their own repository, which is the reason I stored them all in one directory."
(7) "It's a collection of little snippets of programs I write when I test out ideas. Many are written quickly and off the cuff." -> "Some of these are mostly snippets of random code from small projects or experiments. I also use this repository as storage for basic examples like “Hello World”."
(9) "Some of these are mostly snippets of random code from small projects, experiments and some courses. This is also a place to keep those "Hello World" and basic examples. This gives a kind of rough idea of how much I know about a given language, library or framework. They're not complete.: -> "Even though they are not complete, this repository should provide a rough idea of how much I know about a given language, library, or framework."
(13) "library and" -> "library, and"
(17) "make" -> "take"
(18) Deleted "That being said,"

The changes are made in an attempt to help any user easily understand what the repository is trying to accomplish.