FEATURE: Add Readme

Readme.md

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+===== Wegmeister.DatabaseStorage
+
+This package adds the ability to store values of a form (or other input) into database and export the stored data as xlsx.
+
+To add it as a form finisher you have two options:
+
+
+== Use DatabaseStorage in an `old fashioned` yaml definition
+
+Add the DatabaseStorage a finisher in your form definition/yaml file.
+
+```yaml
+type: 'Neos.Form:Form'
+identifier: 'some-identifier'
+label: 'My form'
+renderables:
+  # Your renderables / form fields go here
+
+finishers:
+  -
+    identifier: 'Wegmeister.Database:DatabaseStorage'
+    options:
+      # The identifier is used to group your data in the database.
+      # You should avoid using the same identifier twice or your data could become a little messed up.
+      identifier: 'my-form-data'
+```
+
+
+
+== Use DatabaseStorage with the new Neos Form-Builder
+
+You can also use the DatabseStorage with the new [Neos.Form.Builder](https://github.com/neos/form-builder). 
+You should be able to simply add DatabaseStorage as a finisher to your formular. 
+
+Don't forget to set an (unique) `identifier`!