feat(calpendo_einfra): new service calpendo

docs/services/calpendo_einfra.md

+# calpendo_einfra
+
+### [GEN](../concepts/gen.md)
+
+This script generates login, first name, last name and email of each assigned valid member to a csv file.
+
+### [SEND](../concepts/send.md)
+
+The script uses [generic_sender.py](../modules/generic_sender.md) to send data to the target machine.
+
+### [SLAVE](../concepts/slave.md)
+
+Calls external script, which location needs to be set in a [PRE](../concepts/pre-mid-post.md#pre-script) script. Also expects configuration file to be prepared on
+the target machine.
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