feat: support image resizing, resolve #508 (#545)

* feat: support image resizing, resolve #508

* add docs

src/core/render/compiler.js

@@ -257,6 +257,16 @@ export class Compiler {
         attrs += ` title="${title}"`
       }
 
+      const size = config.size
+      if (size) {
+        const sizes = size.split('x')
+        if (sizes[1]) {
+          attrs += 'width=' + sizes[0] + ' height=' + sizes[1]
+        } else {
+          attrs += 'width=' + sizes[0]
+        }
+      }
+
       if (!isAbsolutePath(href)) {
         url = getPath(contentBase, getParentPath(router.getCurrentPath()), href)
       }