Create README.md

Author: TheKitty

assets/20250623/README.md

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+## June 23, 2025 Python on Microcontrollers Newsletter Assets
+
+Please preface all asset filenames for this issue with 20250623, re. 20250623neopixel.jpg
+
+Please consider using JPG files for size. Use a .jpg file extension, not .JPG or .jfif, please.
+.png files are acceptable too. Please, not .PNG or .svg files.
+
+* All images **must be <=550px wide**
+* Please avoid letterboxed images, e.g. images with black bars.
+
+For videos:
+
+* Capture via https://twittervideodownloader.com/ if necessary
+* Convert to GIF with https://ezgif.com/, max 550 px wide, **file MUST BE < 1MB in size**
+
+To reduce GIF filesize, make them smaller or crop, say to <400px wide, and consider 5 seconds max.