Create readme.md for the image directory (#2603)

The originals of the SVG files are on google drive; this readme provides access information.

epub33/core/images/readme.md

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+The SVG files in this directory have been authored in Google Draw and exported as SVG. The original Google Draw files are on Google Drive, in a separate [folder](https://drive.google.com/drive/folders/1licUypywVSeVUw7CdPyPUhb2xiopVhjf?usp=sharing).
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+Here is the link to the individual files:
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+- [example_rendering_paginated_multiple_spine.svg](https://docs.google.com/drawings/d/1Dyuthmrs1n_oJsarNHzIW3zWlOCXVzga39h3Pu8z8jc/edit?usp=drive_link)
+- [example_rendering_paginated_single_spine.svg](https://docs.google.com/drawings/d/1EVrXwbTn25xuTa_ckU-EcROlzsRA_Pnv5yknCqEwvQU/edit?usp=drive_link)
+- [example_rendering_scrolled_continuous.svg](https://docs.google.com/drawings/d/1MMS-ZVG2igCTZ7-XRKgB6XLMSYVvrUqcfvpew9pzk0M/edit?usp=drive_link)
+- [example_rendering_scrolled_doc.svg](https://docs.google.com/drawings/d/1ehVeyXnSzyF2ljrRkM2sQzCJMOP5gmrCnLuipagaTTU/edit?usp=drive_link)
+- [example_spread_both.svg](https://docs.google.com/drawings/d/1GXZFudaf-lMFSA7Fai8agDy6-YEsAYNVB9QyLFMxeE4/edit?usp=drive_link)
+- [example_spread_both_with_reflowable_intro.svg](https://docs.google.com/drawings/d/1n0gwX4L84rjtyV0FLc3Yv-tu6kCpyRQjo6aP8n3__vE/edit?usp=drive_link)
+- [example_spread_landscape.svg](https://docs.google.com/drawings/d/1d1Q-pjutZFl09FSx-P5Hl_TswiiuW_jTX4lqv47PVfQ/edit?usp=drive_link)
+- [example_spread_none.svg](https://docs.google.com/drawings/d/1uJVY_IkZwWiz3Tux3WfqStfA8cNTbF4jBzHFz84ir7A/edit?usp=drive_link)
+- [example_spread_page_spread_right.svg](https://docs.google.com/drawings/d/1rTwzPcksrs0xPMQPIh3bAMkkt9zV9XUChzCJ2pWjnF8/edit?usp=drive_link)
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+All files should be publicly visible and can be commented upon. If there is any access issue, please contact [Ivan Herman]([email protected]).
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