Please, merge my PowerShell examples for all chapters (#106)

* PowerShell 01_introduction_to_algorithms example

* PowerShell 02_selection_sort example

* PowerShell 03_recursion examples

* PowerShell 04_quicksort examples

* PowerShell 05_hash_tables examples

* PowerShell 06_breadth-first_search example

* PowerShell 07_dijkstras_algorithm example

* PowerShell 08_greedy_algorithms example

* Powershell 09_dynamic_programming example

05_hash_tables/PowerShell/01_price_of_groceries.ps1

@@ -0,0 +1,2 @@
+$book = @{"apple" = 0.6; "milk" = 1.49; "avocado" = 1.49}
+Write-Host ($book | Out-String)

05_hash_tables/PowerShell/02_check_voter.ps1

@@ -0,0 +1,18 @@
+$voted = @{}
+function Check-GRKVoter
+{
+    param($name)
+    if ($voted.Contains($name))
+    {
+        Write-Host "kick them out!"
+    }
+    else
+    {
+        $voted[$name] = $True
+        Write-Host "let them vote!"
+    }
+}
+
+Check-GRKVoter tom
+Check-GRKVoter mike
+Check-GRKVoter mike