Adding license command documentation.

Author: nicholasks

HISTORY.rst

@@ -9,6 +9,7 @@ History
 * Added README information about Python 2.7 workaround
 * Adjusted some pricing information
 * Fixed MacOS binary build through AppVeyor
+* Added the ability to check packages licenses
 
 1.9.0 (2020-04-27)
 ------------------

README.md

@@ -430,6 +430,111 @@ safety review --file report.json --bare
 ```
 django
 ```
+
+___
+
+# License
+
+Display packages licenses information (requires an api-key)
+
+## Options
+
+### `--key` (REQUIRED)
+
+*API Key for pyup.io's licenses database. Can be set as `SAFETY_API_KEY` environment variable.*
+
+**Example**
+```bash
+safety license --key=12345-ABCDEFGH
+```
+*Shows the license of each package in the current environment*
+
+
+```
++==============================================================================+
+|                                                                              |
+|                               /$$$$$$            /$$                         |
+|                              /$$__  $$          | $$                         |
+|           /$$$$$$$  /$$$$$$ | $$  \__//$$$$$$  /$$$$$$   /$$   /$$           |
+|          /$$_____/ |____  $$| $$$$   /$$__  $$|_  $$_/  | $$  | $$           |
+|         |  $$$$$$   /$$$$$$$| $$_/  | $$$$$$$$  | $$    | $$  | $$           |
+|          \____  $$ /$$__  $$| $$    | $$_____/  | $$ /$$| $$  | $$           |
+|          /$$$$$$$/|  $$$$$$$| $$    |  $$$$$$$  |  $$$$/|  $$$$$$$           |
+|         |_______/  \_______/|__/     \_______/   \___/   \____  $$           |
+|                                                          /$$  | $$           |
+|                                                         |  $$$$$$/           |
+|  by pyup.io                                              \______/            |
+|                                                                              |
++==============================================================================+
+| Packages licenses                                                            |
++=============================================+===========+====================+
+| package                                     |  version  | license            |
++=============================================+===========+====================+
+| requests                                    | 2.25.0    | Apache-2.0         |
+|------------------------------------------------------------------------------|
+| click                                       | 7.1.2     | BSD-3-Clause       |
+|------------------------------------------------------------------------------|
+| safety                                      | 1.10.0.de | MIT                |
++==============================================================================+
+```
+
+___
+
+### `--db`
+
+*Path to a directory with a local licenses database `licenses.json`*
+
+**Example**
+```bash
+safety license --key=12345-ABCDEFGH --db=/home/safety-db/data
+```
+___
+
+### `--no-cache`
+
+*Since PyUp.io licenses DB is updated once a week, the licenses database is cached locally for 7 days. You can use `--no-cache` to download it once again.*
+
+**Example**
+```bash
+safety license --key=12345-ABCDEFGH --no-cache
+```
+___
+
+### `--file`, `-r`
+
+*Read input from one (or multiple) requirement files.*
+
+**Example**
+```bash
+safety license --key=12345-ABCDEFGH -r requirements.txt
+```
+```bash
+safety license --key=12345-ABCDEFGH --file=requirements.txt
+```
+```bash
+safety license --key=12345-ABCDEFGH -r req_dev.txt -r req_prod.txt
+```
+
+___
+
+
+### `--proxy-host`, `-ph`
+
+*Proxy host IP or DNS*
+
+### `--proxy-port`, `-pp` 
+
+*Proxy port number*
+
+### `--proxy-protocol`, `-pr`
+
+*Proxy protocol (https or http)*
+
+**Example**
+```bash
+safety license --key=12345-ABCDEFGH -ph 127.0.0.1 -pp 8080 -pr https
+```
+
 ___
 
 # Python 2.7