add readme & thirdparty and freeze pip deps

THIRDPARTY.md

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+# Acknowledgments
+
+## Flask
+
+URL: https://flask.palletsprojects.com/en/stable/  
+Copyright: `Copyright 2010 Pallets`  
+License: BSD-3-Clause  
+Repo: https://github.com/pallets/flask
+
+## ChicagoFLF
+
+Affected files: [`data/static/fonts/ChicagoFLF.woff2`](./data/static/fonts/ChicagoFLF.woff2)  
+No canonical URL that I could find.  
+Obtained from: https://usemodify.com/fonts/chicago/  
+License: Public Domain  
+Designers:  Susan Kare, Robin Casady  
+
+## Cadman
+
+Affected files: [`data/static/fonts/Cadman_Bold.woff2`](./data/static/fonts/Cadman_Bold.woff2) [`data/static/fonts/Cadman_BoldItalic.woff2`](./data/static/fonts/Cadman_BoldItalic.woff2) [`data/static/fonts/Cadman_Italic.woff2`](./data/static/fonts/Cadman_Italic.woff2) [`data/static/fonts/Cadman_Roman.woff2`](./data/static/fonts/Cadman_Roman.woff2)  
+URL: https://localfonts.eu/shop/cyrillic-script/serbian/serbian-cyrillic-sans-serif/cadman/  
+Copyright: `© 2017-2020 by Paul James Miller. All rights reserved.`  
+License: SIL Open Font License 1.1  
+Designers: Paul James Miller  
+
+## ICONCINO
+
+Affected files: [`data/static/misc/error.svg`](./data/static/misc/error.svg) [`data/static/misc/image.svg`](./data/static/misc/image.svg) [`data/static/misc/info.svg`](./data/static/misc/info.svg) [`data/static/misc/lock.svg`](./data/static/misc/lock.svg) [`data/static/misc/sticky.svg`](./data/static/misc/sticky.svg) [`data/static/misc/warn.svg`](./data/static/misc/warn.svg)  
+URL: https://www.figma.com/community/file/1136337054881623512/iconcino-v2-0-0-free-icons-cc0-1-0-license  
+Copyright: Gabriele Malaspina  
+Designers: Gabriele Malaspina  
+License: CC0 1.0/CC BY 4.0  
+CC BY 4.0 compliance: Modified to indicate the URL. Modified size.