Add initial README (#35)

Addresses ENG-1537. Adds initial README.md

---------

Co-authored-by: Nathan Brahms <nbrahms@users.noreply.github.com>

README.md

@@ -1 +1,97 @@
-# p0cli
+<div align="center">
+    <a href="https://github.com/p0-security/p0cli">
+        <img width="200" height="200" src="https://p0.dev/images/logo.png" alt="P0 Security logo">
+    </a>
+</div>
+
+# P0 Security CLI
+
+The offical Command-Line Interface (CLI) for P0.
+
+Supports creating access requests for cloud resources, assuming AWS roles, and connecting to AWS instances.
+
+## Table of Contents
+
+- [About](#about)
+- [Quickstart](#quickstart)
+  - [Installation](#installation)
+  - [Configuration](#configuration)
+- [Command Reference](#command-reference)
+- [Support](#support)
+- [Contributing](#contributing)
+- [Copyright](#copyright)
+
+## About
+
+P0 manages just-in-time access to your cloud resources. The P0 CLI enables developers to seamlessly integrate P0 into their normal workflows by supporting the following use cases:
+
+- Assume an AWS role or SSH into an AWS instance: P0 will request access, wait for access to be approved and provisioned, and then execute the relevant `aws` command
+- Create P0 access requests for any cloud resource
+
+To learn more about P0, see our [docs](https://docs.p0.dev/).
+
+## Quickstart
+
+### Installation
+
+To install the P0 CLI, run:
+
+```
+npm install -g @p0security/p0cli
+```
+
+You can now invoke the CLI by running `p0`.
+
+### Configuration
+
+Before you can make requests using the P0 CLI, you will need to authenticate with your P0 organization. If you don't have a P0 organization account yet, follow our [Quick Start guide](https://docs.p0.dev/getting-started/quick-start) to create an account and install a resource for access requests.
+
+Once you have a P0 organization account, run
+
+```
+p0 login <P0_ORGANIZATION_ID>
+```
+
+then follow the prompts in your browser to complete authentication.
+
+You can now request access via
+
+```
+p0 request
+```
+
+## CLI Reference
+
+### Usage
+
+Interact with the `p0` CLI via:
+
+```
+p0 <command> <options>
+```
+
+To view help, use the `--help` option with any command.
+
+### Available commands
+
+```
+  p0 aws                    Execute AWS commands
+  p0 login <org>            Log in to p0 using a web browser
+  p0 ls [arguments..]       List request-command arguments
+  p0 request [arguments..]  Manually request permissions on a resource
+  p0 ssh <instance>         SSH into a virtual machine
+```
+
+## Support
+
+If you encounter any issues with the P0 CLI, you can open a GitHub issue on this repo, email `support@p0.dev`, or reach out to us on our [community slack](https://join.slack.com/t/p0securitycommunity/shared_invite/zt-1zouzlovp-1kuym9RfuzkJ17ZlvAf6mQ).
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## Copyright
+
+Copyright © 2024-present P0 Security.
+
+The P0 Security CLI is licensed under the terms of the GNU General Public License version 3. See [COPYING.md](COPYING.md) for details.