Add motivation into readme (#9)

Author: abstractlyZach

README.md

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+
+# Magic Tiler
+Magic Tiler will instantly create your own IDE. No need for tmux! Write your own
+configurations easily or look to others' for inspiration: `link to configs`
+
+## Motivation
+Ever since I started using an ultrawide monitor in favor of 2 separate monitors, I realized
+that it was really annoying to open up a ton of windows and resize them when it was always
+just a few repeatable configurations.
+
+### python mode
+* editor for source code
+* editor for tests
+* browser for documentation/tickets
+* terminal for arbitrary commands like linting and running tests
+
+### web dev mode
+* editor for source code
+* editor for tests
+* small terminal running linter
+* small terminal using a filewatcher to run tests
+* small terminal to automatically run typescript compiler
+* medium terminal to run arbitrary commands
+
+### documentation mode
+* editor for document
+* browser/pager for source material
+* window that uses a filewatcher to autocompile the documentation
+
+There were also a lot of consistent configurations that I wanted to use that just wouldn't
+work out of the box. I like splitting my monitor up with 25-50-25 or 20-60-20 ratios and
+that requires a lot of manual resizing. I could also set up elaborate rules in Sway and
+then make sure each window fits into those rules, but I don't even know how that would work
+since Sway can resize floating windows or existing windows, but an IDE that creates itself
+in an instant wouldn't have any existing windows. And rules affect windows at window creation
+so it's like a chicken-and-egg problem
+
+
+Sure, I could just use `tmux`, but that came with some issues:
+* tmux only handles terminals. it doesn't manage browsers, pdf viewers, or anything else
+* tmux has its own keybindings. Even if I used `tmux` next to a browser, I'd be using different commands to jump between tmux and the windows. I can't do that! My brain is smol and it can't handle that complexity.
+
+## Goals
+* use only i3/sway to manage windows
+* create a DIY IDE with a single command
+* allow different IDEs to be defined through a readable file (like TOML)
+* run arbitrary commands (not just shells and TUIs!)
+
+
+## Alternatives
+* [tmux](https://github.com/tmux/tmux)