Add README and LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2021 Harry Marr
+
+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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+# Vitals
+
+A tiny macOS process monitor.
+
+<p align="center">
+<img width="454" alt="Vitals screenshot" src="https://user-images.githubusercontent.com/110275/111912121-1fcdb300-8a60-11eb-8eb8-35dc434a77e6.png">
+</p>
+
+Vitals lives in the menu bar, keeping track of resource usage in the background so you can summon it instantly at any time.
+
+While other tools like Activity Monitor show you each process' _current_ CPU usage, Vitals shows a per-process CPU graph covering the last 60 seconds. This makes it much easier to track down apps that misbehave sporadically.
+
+## Install
+
+Download the [latest release](https://github.com/hmarr/vitals/releases/latest), and move it to "/Applications". Right-click the app in Finder then select "Open" from the context menu.
+
+## Usage
+
+Vitals runs in the background, and lives in your Mac's menu bar. The icon looks like a little "V" in a circle. Click that to open Vitals. To quit, right-click the menu bar icon and select "Quit Vitals" from the menu that appears.