Add plain text support (#1579)

Author: Kajiih

languages.yaml

@@ -2802,6 +2802,30 @@ Tex:
       - white
     chip: "#3D6117"
   icon: '\u{E69B}'
+Text:
+  type: prose
+  ascii: |
+    {0} -----------------
+    {0}| .txt ========== |
+    {0}| =============== |
+    {0}| =============== |
+    {0}| =============== |
+    {0}| =============== |
+    {0}| ============    |
+    {0}|                 |
+    {0}| =============== |
+    {0}| =============== |
+    {0}| =============== |
+    {0}| =============== |
+    {0}| =============== |
+    {0} -----------------
+  colors:
+    ansi:
+      - white
+    hex:
+      - "#d0d0d0"
+    chip: "#ffffff" # No color in linguist
+  icon: '\u{f09a8}'
 Toml:
   type: data
   ascii: |