✨ Add "find-outlier-number" challenge

challenges/find-outlier-number/solutions/typescript-outlier/README.md

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

challenges/find-outlier-number/solutions/typescript-outlier/solution.ts

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+interface NumberObject {
+  value: number
+  index: number
+}
+
+function isOdd (number: number): boolean {
+  return number % 2 !== 0
+}
+
+function solution (numbers: number[]): number {
+  const oddNumbers: NumberObject[] = []
+  const evenNumbers: NumberObject[] = []
+
+  numbers.forEach((number, index) => {
+    const numberObject: NumberObject = { value: number, index }
+    return isOdd(number)
+      ? oddNumbers.push(numberObject)
+      : evenNumbers.push(numberObject)
+  })
+
+  const isValueThatDiffersFromOthers =
+    oddNumbers.length === 1 ? oddNumbers[0] : evenNumbers[0]
+  return isValueThatDiffersFromOthers.value
+}
+
+export default solution