docs: add readme to library crate

Author: EricCrosson

crates/typescript_tools/README.md

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+# TypeScript Tools 🦀
+
+[![Build Status]](https://github.com/typescript-tools/monorepo/actions/workflows/release.yml)
+
+[build status]: https://github.com/typescript-tools/monorepo/actions/workflows/release.yml/badge.svg?event=push
+
+The **typescript-tools** are an opinionated collection of utilities for working with
+TypeScript monorepos. Read more in the [typescript-tools spec].
+
+[typescript-tools spec]: https://github.com/typescript-tools/spec
+
+## The Problem
+
+Whereas [Lerna] was created for managing JavaScript monorepos, TypeScript monorepos have
+additional requirements introduced by the compilation step.
+
+The [original and reference implementation] of the **typescript-tools** is written in
+TypeScript. The Rust implementation of the **typescript-tools** optimizes execution
+speed.
+
+[lerna]: https://github.com/lerna/lerna
+[original and reference implementation]: https://github.com/typescript-tools/typescript-tools
+
+## Goals
+
+The goals of the typescript-tools are to give back the maximum amount of human time
+possible; chiefly through stability and aggressive automation.
+
+The Rust implementation aims to minimize the amount of latency added to your monorepo's
+workflow.
+
+## Supported Systems
+
+The following target triples are supported:
+
+- x86_64-unknown-linux-musl
+- i686-unknown-linux-musl
+- x86_64-apple-darwin
+- aarch64-unknown-linux-musl
+- aarch64-apple-darwin
+
+## Install
+
+Install from the Nix flake or download a precompiled binary from the GitHub Releases page.