Add README.md along with a screenshot

README.md

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+# relkochta/nvim-config
+
+![My Neovim configuration, showing rust-analyzer integration](/screenshot.png?raw=true)
+
+This repository contains my configuration for [Neovim](https://neovim.io/).
+It's written in Lua and uses the [lazy.nvim](https://github.com/folke/lazy.nvim) plugin manager along with [lsp-zero.nvim](https://github.com/VonHeikemen/lsp-zero.nvim) for language server support.
+
+Requirements:
+
+- Neovim 0.8.0
+- Git
+- A C compiler (such as `gcc` or `clang`) for compiling Treesitter parsers
+- `ripgrep` for fuzzy search
+- Any desired language servers (`rust-analyzer`, `clangd`, `bash-language-server`, etc)