docs: Added readme and editorconfig

.editorconfig

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+[*.md]
+indent_style = space
+indent_size = 2
+tab_width = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 120

README.md

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+# GRUB theming utilities
+*Work in progress*
+
+The purpose of this project is to make the process of making GRUB themes much faster and easier for the average user.
+Normally the process would look like this:
+
+1. Create a VM with GRUB as the bootloader
+2. Start writing the theme
+3. Recompile GRUB config
+4. Reboot
+5. Realize something is off by a pixel / there's more work to do
+6. Repeat from step 2 untill:
+  - Theme is finished
+  - Theme is good enough and you're tired
+  - You burn out
+
+Paired with the fact that the iteration cycle is quite slow, this process is going to drive you nuts after a while. Oh,
+and did you know that the documentation is quite lacking too? Like an entire optin was missing and some details are
+ommited? Yeah this is very fun. /s
+
+It is time to put an end to this suffering. I decided to make a tool for previewing the GRUB theme. While it is possible
+that the preview isn't going to be pixel perfect, I hope this tool can get you at least 90% there and you can use a VM
+or real hardware to polish whatever doesn't quite line up.
+
+**TL;DR:** this is a GRUB theme preview tool.
+
+# Roadmap
+
+## MVP
+
+- [ ] A CLI that generates a preview image given a GRUB theme directory and GRUB boot menu state (progress bar state,
+  menu items, etc)
+
+## Nice to have
+
+- [ ] An interactive editor / automatic reload (pref. using WASM so it can be hosted on GH pages and a local version
+  too)
+- [ ] A Github Action to generate previews that can be used to provide release screenshots, update READMEs, etc.