Improve documentation

Author: LeoBorai

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 2

README.md

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 # selection-sort-js
 A "Selection Sort" algorithm implementation in JavaScript
+
+## Installation
+```bash
+npm install @estebanborai/selection-sort
+```
+
+## Usage
+
+### `selectionSort(arr: Array<number>): Array<number>`
+Sorts an array of numbers
+
+```javascript
+import selectionSort from '@estebanborai/selection-sort';
+
+const items = [-1, 10, 2, 0, 6, 8];
+const sorted = selectionSort(items);
+
+console.log(sorted); // [-1, 0, 2, 6, 8, 10]
+```
+
+### `findSmallest(arr: Array<number>): number
+Returns the index of the smallest number in the array.
+_This function is used internally by `selectionSort` and exported._
+
+```javascript
+import { findSmallest } from '@estebanborai/selection-sort';
+
+const items = [1, 25, 88, -10, 11];
+const smallestItemIndex = findSamallest(items);
+
+console.log(smallestItemIndex); // 3
+```
+
+## License
+Licensed under the MIT License

src/find-smallest.js

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 /**
- * findSmallest finds the smallest element in an array
+ * 
+ * @param {array} arr - Array of numbers
+ * 
+ * Finds the smallest element in an array
  * and returns the index.
  *
  */

src/selection-sort.js

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 import findSmallestIndex from './find-smallest';
 
+/**
+ * 
+ * @param {array} arr - Array of numbers
+ * 
+ * Sorts an array of numbers
+ * 
+ */
 function selectionSort(arr) {
 	const totalItems = Number(arr.length);