Add Euclidean Algorithm in PowerShell (algorithm-archivists#626)

* added PowerShell language

* added Euclidean Algorithm in PowerShell

* Corrected indentation in book.json

* Added PowerShell to .editorconfig

* added more meaningful outputs

Author: PaddyKe

Diff for: .editorconfig

@@ -162,7 +162,13 @@ trim_trailing_whitespace = false
 insert_final_newline = false
 end_of_line = lf
 
+# PowerShell
+[*.ps1]
+indent_style = space
+indent_size = 4
+
 # CoffeeScript
 [*.coffee]
 indent_style = space
 indent_size = 2
+

Diff for: book.json

@@ -194,6 +194,10 @@
           "name": "Scheme"
         },
         {
+          "lang": "ps1",
+          "name": "PowerShell"
+	},
+	{
           "lang": "v",
           "name": "Vlang"
         },

Diff for: contents/euclidean_algorithm/code/powershell/euclidean_algorithm.ps1

@@ -0,0 +1,30 @@
+function Sub-Euclid($a, $b) {
+    $a = [Math]::Abs($a)
+    $b = [Math]::Abs($b)
+
+    while ($a -ne $b) {
+        if ($a -gt $b) {
+            $a = $a - $b
+        } else {
+            $b = $b - $a
+        }
+    }
+    
+    return $a
+}
+
+function Mod-Euclid($a, $b) {
+    $a = [Math]::Abs($a)
+    $b = [Math]::Abs($b)
+
+    while ($b -ne 0) {
+        $tmp = $b
+        $b = $a % $b
+        $a = $tmp
+    }
+
+    return $a
+}
+
+Write-Host "Subtraction-based euclidean algorithm result: $(Mod-Euclid $(64 * 67) $(64 * 81))"
+Write-Host "Modulus-based euclidean algorithm result: $(Sub-Euclid $(128 * 12) $(128 * 77))"

Diff for: contents/euclidean_algorithm/euclidean_algorithm.md

@@ -75,6 +75,10 @@ The algorithm is a simple way to find the *greatest common divisor* (GCD) of two
 <p>
   <img  class="center" src="code/scratch/euclid_sub.svg" width="200" />
 </p>
+# leave one line empty:
+
+{% sample lang="ps1" %}
+[import:1-14, lang="powershell"](code/powershell/euclidean_algorithm.ps1)
 
 {% endmethod %}
 
@@ -157,6 +161,10 @@ Modern implementations, though, often use the modulus operator (%) like so
 <p>
   <img  class="center" src="code/scratch/euclid_mod.svg" width="200" />
 </p>
+# leave one line empty:
+
+{% sample lang="ps1" %}
+[import:16-27, lang="powershell"](code/powershell/euclidean_algorithm.ps1)
 
 {% endmethod %}
 
@@ -264,6 +272,10 @@ The code snippets were taken from this [Scratch project](https://scratch.mit.edu
 <p>
   <img  class="center" src="code/scratch/main.svg" width="200" />
 </p>
+# leave one line empty:
+
+{% sample lang="ps1" %}
+[import, lang="powershell"](code/powershell/euclidean_algorithm.ps1)
 
 {% endmethod %}