feat(auth): Add OAuth2 authentication

README.md

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+# SecNex CLI
+
+The SecNex CLI is a command line tool for the SecNex API. It allows you to manage your SecNex API resources from the command line.
+
+## Features
+
+- [x] Login via OAuth2 and secure saving of the access token with keyring
+
+## Installation
+
+```bash
+pip install secnex-cli
+```
+
+## Usage
+
+```bash
+secnex auth login
+```
+
+## Commands
+
+### auth
+
+#### login
+
+Login to the SecNex API
+
+```bash
+secnex auth login
+```
+
+#### logout
+
+Logout from the SecNex API
+
+```bash
+secnex auth logout
+```
+
+#### status
+
+Check if user is already logged in
+
+```bash
+secnex auth status
+```