Add "Build Tower" kata

Author: juanantonioledesma

6-kyu/build-tower.md

@@ -0,0 +1,56 @@
+<h1>Build Tower <sup><sup>6 Kyu</sup></sup></h1>
+
+<sup>
+  <a href="https://www.codewars.com/kata/576757b1df89ecf5bd00073b">
+    <strong>LINK TO THE KATA</strong>
+  </a> - <code>STRINGS</code> <code>ASCII ART</code> <code>FUNDAMENTALS</code>
+</sup>
+
+## Description
+
+Build a pyramid-shaped tower, as an array/list of strings, given a positive integer `number of floors`. A tower block is represented with `"*"` character.
+
+For example, a tower with `3` floors looks like this:
+
+```
+[
+  "  *  ",
+  " *** ",
+  "*****"
+]
+```
+
+And a tower with `6` floors looks like this:
+
+```
+[
+  "     *     ",
+  "    ***    ",
+  "   *****   ",
+  "  *******  ",
+  " ********* ",
+  "***********"
+]
+```
+
+## Solution
+
+```javascript
+const towerBuilder = nFloors => {
+  const piramidBase = nFloors * 2 - 1
+  let floorsArray = []
+
+  for (let i = 1; i < nFloors + 1; i++) {
+    const currentFloorBase = i * 2 - 1
+    const bricks = '*'.repeat(currentFloorBase)
+    const spaceDifference = (piramidBase - currentFloorBase) / 2
+    const blankSpace = ' '.repeat(spaceDifference)
+
+    const floorBuilt = `${blankSpace}${bricks}${blankSpace}`
+
+    floorsArray.push(floorBuilt)
+  }
+
+  return floorsArray
+}
+```

README.md

@@ -25,6 +25,7 @@ JavaScript katas on Codewars are programming challenges that help you improve yo
 - **[Array.diff](./6-kyu/array-diff.md)**
 - **[Bit Counting](./6-kyu/bit-counting.md)**
 - **[Break camelCase](./6-kyu/break-camel-case.md)**
+- **[Build Tower!](./6-kyu/build-tower.md)**
 - **[Card game](./6-kyu/card-game.md)**
 - **[Checkered Board](./6-kyu/checkered-board.md)**
 - **[Convert string to camel case](./6-kyu/convert-string-to-camel-case.md)**