add README.md

README.md

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+# [fulcrm](https://fulcrm.org/) integration for [SaltStack](https://saltstack.com)
+
+## Configuration
+
+Add to `/etc/salt/master` or `/etc/salt/master.d/fulcrm.conf` or something similar:
+
+``` yaml
+extension_modules: /srv/salt/modules
+
+ext_pillar:
+  - fulcrm:
+      username: test_api_user
+      api_key: f097dd69c733854dd8473f3c99179e93838d5999
+```