add README.md and NOTICE

NOTICE

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+Copyright 2022 Grafana Labs
+Licensed under the Apache License, Version 2.0 (the "License");
+
+Some code and components for this project have been derived from the following:
+
+Telegraf
+https://github.com/influxdata/telegraf
+Copyright (c) 2015-2020 InfluxData Inc.
+Licensed under the MIT License
+
+govmomi
+https://github.com/vmware/govmomi
+Copyright (c) 2014-2021 VMware, Inc. All Rights Reserved.
+Licensed under the Apache License, Version 2.0

README.md

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-# vmware_exporter
+# vmware_exporter
+
+Note: This project is still in the early stages of development and not considered production ready. Very little testing
+against live environments has been done; defects are to be expected at this stage. With that said, any feedback is
+greatly appreciated.
+
+## Collect vSphere Performance Metrics
+The vSphere collector connects to a vCenter sdk endpoint and discovers managed objects in the datacenter inventory.
+Resource discovery will occur per scrape by default; however, it can also be configured to run in the background on an
+interval by setting the discovery interval command line flag. Currently, most of the object discovery code is ported
+from the telegraf vSphere plugin.
+
+For all resources discovered, the collector will attempt to gather the latest sample of aggregated instance data
+from the vSphere performance manager and expose them on the telemetry path (default /metrics).
+
+## Usage
+```
+Usage of ./vmware_exporter:
+  -vsphere.discovery-interval duration
+        Object discovery duration interval. Discovery will occur per scrape if set to 0.
+  -vsphere.mo-chunk-size int
+        Managed object reference chunk size to use when fetching from vSphere. (default 5)
+  -vsphere.url value
+        vSphere SDK URL.
+  -web.config string
+        Path to config yaml file that can enable TLS or authentication.
+  -web.listen-address string
+        Address on which to expose metrics and web interface. (default ":9237")
+  -web.telemetry-path string
+        Path under which to expose metrics. (default "/metrics")
+```
+
+### Example
+```
+./vmware_exporter -vsphere.url http://user:[email protected]:8989/sdk -vsphere.mo-chunk-size 10
+```