Extend README (#19)

Signed-off-by: Christian Berendt <[email protected]>

README.md

@@ -1 +1,40 @@
 # netbox-manager
+
+## Installation
+
+```
+$ pipenv shell
+$ pip install netbox-manager
+$ ansible-galaxy collection install -r requirements.yml
+```
+
+## Configuration
+
+```toml
+DEVICETYPE_LIBRARY = "example/devicetype-library"
+IGNORE_SSL_ERRORS = true
+RESOURCES = "example/resources"
+TOKEN = ""
+URL = "https://XXX.netbox.regio.digital"
+VERBOSE = true
+```
+
+## Usage
+
+```
+$ pipenv shell
+$ netbox-manager --help
+ Usage: netbox-manager [OPTIONS]
+
+╭─ Options ───────────────────────────────────────────────────────────────────────────────────────────╮
+│ --limit                      TEXT  Limit files by prefix [default: None]                            │
+│ --wait       --no-wait             Wait for NetBox service [default: wait]                          │
+│ --skipdtl    --no-skipdtl          Skip device type library [default: no-skipdtl]                   │
+│ --help                             Show this message and exit.                                      │
+╰─────────────────────────────────────────────────────────────────────────────────────────────────────╯
+```
+
+## Documentation
+
+* https://docs.ansible.com/ansible/latest/collections/netbox/netbox/index.html
+* https://github.com/netbox-community/devicetype-library