Add readme file

Author: cadamini

readme.md

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+# Random CSV data generator 
+
+This is the attempt to generate random csv data
+
+It creates data for the complete year for past years. 
+
+For the current year it generates data until yesterday. 
+
+## Usage
+
+`ruby random_csv.rb`
+
+will show the context help which explains the usage
+
+### Parameters
+
+You need to use them in the following order
+
+YEAR, e.g. 2020, default: 2019
+REGION, e.g. 'de', 'uk' or 'us', default: 'de'
+QUEUE NAME, e.g. Hotline, default: 'Test-Queue'
+OPENINGS START time, e.g. 10 default: 8
+OPENINGS END time, e.g. 20, default: 18
+INTERVAL, e.g. 30, default: 15
+
+### Example
+
+ruby random_csv.rb 2019 'en' 'Hotline' 10 20
+
+### Minimal parameter set 
+
+For the current year, German holidays, openings 8 - 18 and 15 minutes intervals
+you can use simply
+
+`ruby random_csv.rb 2019` 
+
+If you want to output anything else, you need to enter all parameters.
+
+### Generate CSV files 
+
+To generate a file use the > operator
+
+`ruby random_csv.rb 2019 'en' 'Hotline' 10 20 > 'output_files/Hotline-2019.csv'`