Add images of example frames

I think it would be helpful to include, in this repo, digital images of several example frames of film. The Archive website has only a couple of frames. I'd like to see more, showing exactly what the first human-readable frames look like, then what the first encoded frames look like.
It helps to put the GUIDE into context.

先閱讀 GUIDE，並查看 Archive 網站上目前提供的範例。找出此 repository 儲存文件影像的位置，並判斷應新增哪些人類可讀的影片影格和編碼後的影片影格。完成的標準是：repository 包含多個標示清楚的範例影格影像，用於幫助理解 GUIDE 的內容。

由索引模型根據 Issue 內容生成。