feat: Add github-green-purple theme (DenverCoder1#251)

Author: pushpak-256

docs/themes/README.md

@@ -81,6 +81,7 @@ You can also try out and customize these themes on the [Demo Site](https://githu
 |      `navy-gear`       | ![image](https://user-images.githubusercontent.com/20955511/153954354-60438cfa-d0a0-4737-936c-65b61faf637d.png) |
 |      `hacker`          | ![image](https://user-images.githubusercontent.com/20955511/164965194-724816b5-5aa0-4c36-8bae-f3cbafd2c2a4.png) |
 |      `garden`          | ![image](https://user-images.githubusercontent.com/44000014/165035015-153d9b3a-bd3a-4e34-b252-3c64ab081b75.png) |
+|  `github-green-purple` | ![image](https://user-images.githubusercontent.com/20955511/173238945-f572fdfb-dbf6-4141-8ee6-b70f6186548e.png)  |
 ### Can't find the theme you like?
 
 You can now customize your stats card with the interactive [Demo Site](https://github-readme-streak-stats.herokuapp.com/demo/) or by customizing the [url parameters](/README.md#-options).

src/themes.php

@@ -902,4 +902,16 @@
         "sideLabels" => "#6FDD6C",
         "dates" => "#6FDD6C",
     ],
+    "github-green-purple" => [
+        "background" => "#000",
+        "border" => "#000",
+        "stroke" => "#e4e2e2",
+        "ring" => "#7fff00",
+        "fire" => "#7fff00",
+        "currStreakNum" => "#800080",
+        "sideNums" => "#7fff00",
+        "currStreakLabel" => "#800080",
+        "sideLabels" => "#7fff00",
+        "dates" => "#fff",
+    ],
 ];