Add README.md

README.md

+# Hardware inventory [(Download the MKP package)](/../../../-/raw/master/inv_opengear_base.mkp "Download MKP package")
+
+This plugin adds the serial number, model, manufacturer and firmware version of opengear console servers to the inventory.
+
+---
+
+### Plugin Info:
+
+Supported models:
+- IM4216
+- CM7116
+- CM7132
+- CM7148
+
+---
+
+### Want to contribute?
+Nice ;-) Have a look at the [contribution guidelines](CONTRIBUTING.md "Contributing")
+
+---
+
+Sample inventory output
+
+![sample inventory output](/doc/sample-inventory.png?raw=true "sample inventory output")