✨ Add "is-palindrome" challenge

challenges/is-palindrome/solutions/typescript-palindrome/README.md

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+# typescript-palindrome - is-palindrome
+
+Programming language : TypeScript
+Created by [@Divlo](https://github.com/Divlo) at 5 July 2020.

challenges/is-palindrome/solutions/typescript-palindrome/solution.ts

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+function solution (string: string) {
+  const formattedString = string.replace(/ /g,'').toLowerCase()
+  return formattedString === formattedString.split("").reverse().join('')
+}
+
+export default solution