feat: Added material theme (#330)

Co-authored-by: Jonah Lawrence <[email protected]>

Author: tranthaituananh

docs/themes.md

@@ -95,6 +95,7 @@ You can also try out and customize these themes on the [Demo Site](https://strea
 |          `sea-dark`           | ![image](https://user-images.githubusercontent.com/103951737/184301879-953370eb-e61a-4e0f-abf4-7029c336e8f1.png) |
 |         `violet-dark`         | ![image](https://user-images.githubusercontent.com/103951737/184529784-05de7e57-b939-42f7-9852-345fa191c343.png) |
 |           `horizon`           |  ![image](https://user-images.githubusercontent.com/3828247/184559656-e1f1b290-0a44-45cc-9681-010577386760.png)  |
+|          `material`           | ![image](https://user-images.githubusercontent.com/20955511/193617994-dfab039d-b111-4a95-a00d-39517d9e40ab.png)  |
 
 ### Can't find the theme you like?
 

src/themes.php

@@ -386,6 +386,18 @@
         "sideLabels" => "#2aa889",
         "dates" => "#99d1ce",
     ],
+    "material" => [
+        "background" => "#263238",
+        "border" => "#e4e2e2",
+        "stroke" => "#e4e2e2",
+        "ring" => "#80cbc4",
+        "fire" => "#80cbc4",
+        "currStreakNum" => "#ffab91",
+        "sideNums" => "#80cbc4",
+        "currStreakLabel" => "#ffab91",
+        "sideLabels" => "#80cbc4",
+        "dates" => "#b0bec5",
+    ],
     "material-palenight" => [
         "background" => "#292d3e",
         "border" => "#e4e2e2",