Added documentation

Author: Ricardo Ruiz Saiz

nifi-nifiCKANFlowfileUploader-processors/README.md

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+# Apache Nifi CKAN flowfile uploader
+
+This is a custom [Apache Nifi](https://nifi.apache.org/) processor that, using the CKAN API, is able to:
+* Check the existence and create organizations
+* Check the existence and create packages
+* Upload the flowfile to the package
+
+## Behaviour
+
+It receives an input flowfile with a path to a file and handles the creation (if needed) of the organization and package in ckan to be able to upload that file to it.
+
+## Configuration
+
+The processor has 6 properties to be filled before running:
+
+* **CKAN_url**: Url of the CKAN instance to write to
+* **api_key**: Personal API-Key provided by CKAN
+* **organization_id**: Name of the organization to upload the file to, or create if it does not exists.
+* **package_name**: *(optional)* Name for the creating of the package. When empty, the filename attribute of the flowfile will be used.
+* **package_description**: *(optional)* Description of the package
+* **package_visibility**: *(optional)* Choose the visibility of the package between private or public