✨ Add "camel-case" challenge

challenges/camel-case/solutions/typescript-camelcase/README.md

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

challenges/camel-case/solutions/typescript-camelcase/solution.ts

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+function solution (string: string) {
+  return string.length === 0
+    ? ''
+    : string
+        .trim()
+        .split(' ')
+        .map((word, index) => {
+          if (index === 0) return word
+          return word[0].toUpperCase() + word.slice(1)
+        })
+        .join('')
+}
+
+export default solution