Function isHexColor

isHexColor(value: string): boolean
Returns true if the string is a valid CSS hex color (#rgb or #rrggbb).
Parameters
- value: string
  The string to validate.
Returns boolean
Example
```
isHexColor("#fff")    // => true
isHexColor("#1A2B3C") // => true
isHexColor("fff")     // => false
```
- Defined in validation/isHexColor/index.ts:13