Override icon with an image URL

added image attribute to override icon with a URL.

README.md

@@ -79,6 +79,7 @@ We recommend looking at the [Example usage section](#example-usage) to understan
 | type ***(required)*** | string |  | v0.0.1 | `custom:mini-graph-card`.
 | entities ***(required)*** | list |  | v0.2.0 | One or more sensor entities in a list, see [entities object](#entities-object) for additional entity options.
 | icon | string |  | v0.0.1 | Set a custom icon from any of the available mdi icons.
+| icon_image | string | optional | v0.11.0 | Override icon with an image url
 | name | string |  | v0.0.1 | Set a custom name which is displayed beside the icon.
 | unit | string |  | v0.0.1 | Set a custom unit of measurement.
 | tap_action | [action object](#action-object-options) |  | v0.7.0 | Action on click/tap.

src/main.js

@@ -227,6 +227,13 @@ class MiniGraphCard extends LitElement {
   }
 
   renderIcon() {
+
+    if (this.config.icon_image != undefined){
+      return html` <div class="entity__icon">
+        <img src="${this.config.icon_image}" height=25/>
+      </div>`;
+    }
+
     const { icon, icon_adaptive_color } = this.config.show;
     return icon ? html`
       <div class="icon" loc=${this.config.align_icon}