feat: add java-dark theme (#282)

Author: Андрей Кожев

docs/themes/README.md

@@ -85,6 +85,7 @@ You can also try out and customize these themes on the [Demo Site](https://githu
 |       `icegray`        | ![image](https://user-images.githubusercontent.com/20955511/177644018-cb9953d0-31a1-4920-a66f-8c08672cec38.png)  |
 |    `neon_blurange`     | ![image](https://user-images.githubusercontent.com/45172775/180076569-3af18421-56f5-49bd-b62e-2dec8edc0502.png)  |
 |      `yellowdark`      | ![image](https://user-images.githubusercontent.com/103951737/180445402-360653bf-b85d-4e53-a1e1-cbda4135326b.png) |
+|      `java-dark`       | ![image](https://user-images.githubusercontent.com/103951737/180605906-b04afca3-da60-4ad9-95d3-8be5ef0a96e3.png) |
 
 ### Can't find the theme you like?
 

src/themes.php

@@ -950,4 +950,16 @@
         "sideLabels" => "#FFEF00",
         "dates" => "#A5A5A5",
     ],
+    "java-dark" => [
+        "background" => "#000000",
+        "border" => "#F89820",
+        "stroke" => "#F89820",
+        "ring" => "#F89820",
+        "fire" => "#F89820",
+        "currStreakNum" => "#5382A1",
+        "sideNums" => "#5382A1",
+        "currStreakLabel" => "#F89820",
+        "sideLabels" => "#F89820",
+        "dates" => "#5382A1",
+    ],
 ];