Add "Multiplication table for number" kata

Author: juanantonioledesma

8-kyu/multiplication-table-for-number.md

@@ -0,0 +1,45 @@
+<h1>Multiplication table for number <sup><sup>8 Kyu</sup></sup></h1>
+
+<sup>
+  <a href="https://www.codewars.com/kata/5a2fd38b55519ed98f0000ce">
+    <strong>LINK TO THE KATA</strong>
+  </a> - <code>FUNDAMENTALS</code> <code>STRINGS</code>
+</sup>
+
+## Description
+
+Your goal is to return multiplication table for `number` that is always an integer from 1 to 10.
+
+For example, a multiplication table (string) for `number == 5` looks like below:
+
+```
+1 * 5 = 5
+2 * 5 = 10
+3 * 5 = 15
+4 * 5 = 20
+5 * 5 = 25
+6 * 5 = 30
+7 * 5 = 35
+8 * 5 = 40
+9 * 5 = 45
+10 * 5 = 50
+```
+
+P. S. You can use `\n` in string to jump to the next line.
+
+Note: newlines should be added between rows, but there should be no trailing newline at the end. If you're unsure about the format, look at the sample tests.
+
+## Solution
+
+```javascript
+const multiTable = number => {
+  let result = ''
+
+  for (let i = 1; i <= 10; i++) {
+    const multiplication = `${i} * ${number} = ${i * number}`
+    result += i === 10 ? multiplication : `${multiplication}\n`
+  }
+
+  return result
+}
+```

README.md

@@ -73,6 +73,7 @@ JavaScript katas on Codewars are programming challenges that help you improve yo
 ## 8 kyu
 
 - **[Is your period late?](./8-kyu/is-your-period-late.md)**
+- **[Multiplication table for number](./8-kyu/multiplication-table-for-number.md)**
 - **[Multiply](./8-kyu/multiply.md)**
 - **[Object Oriented Piracy](./8-kyu/object-oriented-piracy.md)**
 - **[Opposites Attract](./8-kyu/opposites-attract.md)**