feat: Contributed themes - elegant & leafy (#198)

Co-authored-by: Jonah Lawrence <jonah@freshidea.com>

Author: DalpatRathore

docs/themes/README.md

@@ -75,6 +75,8 @@ You can also try out and customize these themes on the [Demo Site](https://githu
 |     `noctis-minimus`   | ![image](https://user-images.githubusercontent.com/20955511/135754306-58ceccde-90d9-46f9-a7b2-1cb54b6fbe24.png) |
 |     `github-dark`      | ![image](https://user-images.githubusercontent.com/62628408/135931624-9e6bf6b8-4965-4c7d-87f6-08217ea9274f.png) |
 |     `github-light`     | ![image](https://user-images.githubusercontent.com/62628408/135933355-4f978283-5a3e-44cc-9d12-3a711a79d287.png) |
+|      `elegant`         | ![image](https://user-images.githubusercontent.com/69510006/146630974-9f981228-5680-458b-a1e5-78a15de35690.jpg) |
+|      `leafy`           | ![image](https://user-images.githubusercontent.com/69510006/146630969-ff7bc045-518e-43c0-83df-2d275f3e4b1d.jpg) |
 ### 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

@@ -830,4 +830,28 @@
       "sideLabels" => "#24292F",
       "dates" => "#1F6FEB",
   ],
+    "elegant" => [
+      "background" => "#03071e",
+      "border" => "#abcdef",
+      "stroke" => "#abcdef",
+      "ring" => "#ca6702",
+      "currStreakNum" => "#abcdef",
+      "fire" => "#e85d04",
+      "sideNums" => "#abdcfe",
+      "currStreakLabel" => "#abcdef",
+      "sideLabels" => "#fedcba",
+      "dates" => "#ff7b00",
+  ],
+  "leafy" => [
+      "background" => "#081c15",
+      "border" => "#abcdef",
+      "stroke" => "#081c15",
+      "ring" => "#abcdef",
+      "currStreakNum" => "#ff5400",
+      "fire" => "#abcdef",
+      "sideNums" => "#ff5400",
+      "currStreakLabel" => "#ff5400",
+      "sideLabels" => "#abcabc",
+      "dates" => "#fecfec",
+  ],
 );