✨ Add "is-palindrome" challenge

challenges/is-palindrome/README.md

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+# is-palindrome
+
+Created by [@Divlo](https://github.com/Divlo) at 5 July 2020.
+
+## Instructions :
+
+The function should return `true` if a given string (case insensitive) is a palindrome and `false` if it's not the case.
+
+**Note :** a **Palindrome** is a word, phrase, or sequence that reads the **same backwards as forwards**, e.g. Kayak.
+
+## Examples :
+
+See the `input-output.json` file for examples of input/output.

challenges/is-palindrome/input-output.json

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+[
+  {
+    "input": ["kayak"],
+    "output": true
+  },
+  {
+    "input": ["hello"],
+    "output": false
+  },
+  {
+    "input": ["Was it a cat I saw"],
+    "output": true
+  },
+  {
+    "input": ["No lemon, no melon"],
+    "output": true
+  },
+  {
+    "input": ["achievement"],
+    "output": false
+  }
+]

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