chore: 著作権とライセンスについての情報を各ファイルに追加する (#11348)

* chore: Add the SPDX information to each file

Add copyright and licensing information as defined in version 3.0 of
the REUSE Specification.

* tweak format

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

packages/frontend/src/components/MkRippleEffect.vue

@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
 <template>
 <div :class="$style.root" :style="{ zIndex, top: `${y - 64}px`, left: `${x - 64}px` }">
 	<svg width="128" height="128" viewBox="0 0 128 128" xmlns="http://www.w3.org/2000/svg">