Add README and license

LICENSE

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+Copyright 2021 Kim Silkebækken
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# m o n o t o n e
+
+Another monochrome vim colorscheme. Inspired by various
+[other](https://github.com/ewilazarus/preto)
+[monochrome](https://github.com/pbrisbin/vim-colors-off)
+[colorschemes](https://github.com/fxn/vim-monochrome).
+
+Monotone is a middle ground between a regular colorscheme and [no syntax
+highlighting at all](https://www.kyleisom.net/blog/2012/10/17/syntax-off/). The
+colorscheme differentiates comments, strings and keywords with different
+weights and shades of gray. It emphasizes errors, warnings and search
+highlighting as shown in the screenshots below.
+
+This is a neovim-specific version of
+[vim-monotone](https://github.com/Lokaltog/vim-monotone) based on
+[lush.nvim](https://github.com/rktjmp/lush.nvim). This version includes full
+support for both dark and light `background`.
+
+## Installation
+
+Monotone depends on [lush.nvim](https://github.com/rktjmp/lush.nvim). Example using packer.nvim:
+
+```
+require('packer').startup(function()
+  -- ...
+  use 'rktjmp/lush.nvim'
+  use 'Lokaltog/monotone.nvim'
+  -- ...
+end)
+
+api.nvim_command 'colorscheme monotone'
+```
+
+## Customization
+
+The theme color may be customized by setting HSL values with
+`g:monotone_[hsl]`.
+
+You may adjust the colorscheme contrast to your liking by setting
+`g:monotone_contrast`.
+
+The default contrast factor is 105. Recommended values are between 90 and 110.
+
+## Configuration example
+
+```
+vim.g.monotone_h = 85
+vim.g.monotone_s = 30
+vim.g.monotone_l = 50
+vim.g.monotone_contrast = 110
+vim.g.monotone_true_monotone = true
+vim.o.background = 'light'
+```