✨ Add "camel-case" challenge

.gitignore

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-node_modules
+node_modules
+.vscode

challenges/camel-case/README.md

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+# camel-case
+
+Created by [@Divlo](https://github.com/Divlo) at 5 July 2020.
+
+## Instructions :
+
+Write a simple camelCase function for strings. All words (except the first) must have their first letter capitalized without spaces.
+
+**Note :** camelCase is the practice of writing phrases such that each word or abbreviation in the middle of the phrase begins with a capital letter, with no intervening spaces or punctuation. 
+
+## Examples :
+
+See the `input-output.json` file for examples of input/output.

challenges/camel-case/input-output.json

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+[
+  {
+    "input": ["camel case"],
+    "output": "camelCase"
+  },
+  {
+    "input": ["say hello "],
+    "output": "sayHello"
+  },
+  {
+    "input": [" camel case word "],
+    "output": "camelCaseWord"
+  },
+  {
+    "input": [""],
+    "output": ""
+  }
+]

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