how to add color in text github readme

C++

```diff
- text in red
+ text in green
! text in orange
# text in gray
@@ text in purple (and bold)@@

.text-white on .bg-blue

.text-gray-dark on .bg-blue-light

.text-white on .bg-red

.text-red on .bg-red-light

.text-gray-dark on .bg-green-light

.text-gray-dark on .bg-yellow

.text-gray-dark on .bg-yellow-light

.text-white on .bg-purple

.text-white on .bg-gray-dark

.text-gray-dark on .bg-gray

- ![#f03c15](https://via.placeholder.com/15/f03c15/000000?text=+) `#f03c15` - ![#c5f015](https://via.placeholder.com/15/c5f015/000000?text=+) `#c5f015` - ![#1589F0](https://via.placeholder.com/15/1589F0/000000?text=+) `#1589F0`

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