Add README

Author: sprankhub

README.md

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+# CustomGento_Invoice (Magento 2)
+This extension extends the default Magento 2 purchase order payment method by a customer group and admin filter.
+
+## Description
+This extension for Magento 2 extends the default purchase order payment method by two new configuration options:
+
+* Define that the payment method should only be available for specific customer groups.
+* Define that the payment method should only be available in the backend.
+
+## Compatibility
+* Magento >= 2.3.3
+
+## Installation Instructions
+The installation procedure highly depends on your setup. In any case, you should use a version control system like git and test the installation on a development system.
+
+### Composer Installation
+1. `composer require customgento/module-invoice-m2`
+2. `bin/magento module:enable CustomGento_Invoice`
+3. `bin/magento setup:upgrade`
+4. `bin/magento setup:di:compile`
+5. `bin/magento cache:flush`
+
+### Manual Installation
+1. unzip the downloaded files
+2. create the directory `app/code/CustomGento/Invoice/`: `mkdir -p app/code/CustomGento/Invoice/`
+3. copy the unzipped files to the newly created directory `app/code/CustomGento/Invoice/`
+4. `bin/magento module:enable CustomGento_Invoice`
+5. `bin/magento setup:upgrade`
+6. `bin/magento setup:di:compile`
+7. `bin/magento cache:flush`
+
+## Uninstallation
+The installation procedure depends on your setup:
+
+### Uninstallation After Composer Installation
+1. `bin/magento module:uninstall CustomGento_Invoice`
+2. `bin/magento setup:di:compile`
+3. `bin/magento cache:flush`
+
+### Uninstallation After Manual Installation
+1. `bin/magento module:disable CustomGento_Invoice`
+2. `bin/magento setup:di:compile`
+3. `bin/magento cache:flush`
+4. `rm -r app/code/CustomGento/Invoice`
+
+## Support
+If you have any issues with this extension, feel free to [open an issue on GitHub](https://github.com/customgento/CustomGento_Invoice-m2/issues).
+
+## Licence
+[Open Software License 3.0](https://opensource.org/licenses/OSL-3.0)
+
+## Copyright
+(c) 2018-2020 CustomGento / Simon Sprankel