adding custom rules/decoders files

[cadoming]

This PR is inspired by the PR #62 that the user @memelet, thank you @memelet for your work, with the aim of adding extra local rules/decoders files.

To make this work we have modified the files:

• tasks/main.yml adding new tasks ("Adding local rules" and "Adding local decoders")
• defaults/main.yml to include the variables used in the new tasks in tasks/main.yml

In addition, we have created the example files:

• custom_ruleset/rules/sample_custom_rules.xml
• custom_ruleset/decoders/sample_custom_decoders.xml

[SitoRBJ]

Hello @cadoming and @memelet,

Very good work. We have checked the modifications and they work perfectly.

Thank you so much for your contribution. We proceed to merge the code.

Kind regards,

Alfonso Ruiz-Bravo