Preparation for application catalog 2 (#45)

* Upload changelog and readme

* Fix link

README.md

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+## Lightmeter for Flipper Zero
+
+Lightmeter app for photography based on BH1750 sensor
+
+## Support
+
+For app feedback, bugs, and feature requests, please create an issue here: https://github.com/oleksiikutuzov/flipperzero-lightmeter/issues

docs/changelog.md

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+## v1.0
+
+Initial release for Flipper Application Catalog