Add README with planned tools

README.md

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+# AlexScript
+
+AlexScript (which is a misnomer; the language will soon be renamed
+since it's not actually a scripting language) is a programming
+language designed to have a functional feel and very high-level
+ergonomics while maintaining speed using strictly-controlled,
+deterministic memory management.
+
+## Tools
+
+This repository contains the following current and planned tools:
+- `axc`, the AlexScript compiler. This can be used as a binary with a
+  fairly standard compiler CLI, or as a library for use in other
+  programs.
+- `axcd`, the Language Server Protocol (LSP) server for AlexScript
+  code support in editors, supporting definition peeking and lookup,
+  renaming variables and modules, etc. (Planned; does not exist yet.)
+- `axfmt`, the standard formatter for AlexScript code; all AlexScript
+  code used in this repository must be formatted with `axfmt`, and its
+  use is recommended for other projects. (Planned; does not exist
+  yet.)
+- `alexscript-mode`, an Emacs mode for editing AlexScript code,
+  supporting syntax highlighting, automatic indentation, some basic
+  keybindings for common tasks, Emacs-side LSP integration for
+  communicating with `acxd`, and a collection of `yasnippet` snippets
+  for inserting common AlexScript constructs. (Planned; does not exist
+  yet.)
+- `alexscript-vsc`, Visual Studio Code plugins and tools for editing
+  AlexScript code. (Planned; does not exist yet.)
+- `alexscript-vim`, tools and configuration files for optimizing Vim
+  and Neovim for editing AlexScript code. (Planned; does not exist
+  yet.)