docs: add design contribution guidelines

DESIGN.md

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+# LosslessCut Design Guidelines & Resources
+
+A collection of design contribution guidelines and resources for LosslessCut.
+
+> **All participating designers are highly encouraged to shape and evolve these guidelines!**
+
+## 👋 Welcome
+
+LosslessCut is the swiss army knife of lossless video/audio editing. 
+
+LosslessCut aims to be the ultimate cross platform graphical user interface for extremely fast and lossless operations on video, audio, subtitle and other related media files. 
+
+We highly encourage you to [download](https://github.com/mifi/lossless-cut/releases) and try the tool on your own first.
+
+## 🚢 How to contribute design
+
+1. Check out open [issues](https://github.com/mifi/lossless-cut/issues) here on GitHub (we label them with `design: 💅required`)
+2. Feel free to open an issue on your own if you find something you would like to contribute to the project and use the `design: 💡idea` label for it.
+3. Clone the public Figma files if available or create new ones and share them publicly
+4. Add your contributions to an issue and we promise we will review your contribution carefully and foster discussions
+
+**We encourage you to:**
+
+- Get in touch with the team by starting a discussion on [GitHub](https://github.com/mifi/lossless-cut/discussions).
+
+## 🎭 Target audience
+
+Since we are creating a product for video and audio editors we are target people who are familiar with image, video and audio editing experience. Most of them will have experience with existing editing tools like Audacity, Premiere, etc
+
+## 💅 Design relevant materials
+
+We do not have any design relevant materials yet – so feel free to create some and update these docs
+
+### User Interface
+
+TBC
+
+### Fonts
+
+TBC
+
+### Colors
+
+TBC
+
+
+## 🎓 License
+
+All design work is licensed under the
+[GPL-2.0 license](https://github.com/mifi/lossless-cut/blob/master/LICENSE)
+
+[(Back to top)](#-table-of-contents)

README.md

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   The swiss army knife of lossless video/audio editing
 	<br>
   <img src="https://github.com/mifi/lossless-cut/workflows/Build/release/badge.svg" />
-  <a href="https://paypal.me/mifino/usd"><img src="https://img.shields.io/badge/Donate-PayPal-green.svg" /></a> <a href="https://github.com/mifi/lossless-cut#download"><img src="https://img.shields.io/github/v/release/mifi/lossless-cut" /></a> <a href="https://discord.gg/fhnEREfUJ3"><img src="https://img.shields.io/discord/986051448385183804" /></a>
+  <a href="https://paypal.me/mifino/usd"><img src="https://img.shields.io/badge/Donate-PayPal-green.svg" /></a> <a href="https://github.com/mifi/lossless-cut#download"><img src="https://img.shields.io/github/v/release/mifi/lossless-cut" /></a> <a href="https://discord.gg/fhnEREfUJ3"><img src="https://img.shields.io/discord/986051448385183804" /></a> <a href="https://contribute.design/mifi/lossless-cut"><img src="https://contribute.design/api/shield/mifi/lossless-cut" /></a>
 	<br>
 	<br>
   <a href="https://mifi.no/thanks/">Thanks to my supporters</a> and everyone who purchased LosslessCut!