add README

README.md

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+# vmalertcli
+
+A CLI application to manage VictoriaMetrics vmalert.
+
+All actions return JSON objects (prettyprint TBA), so usage of `jq` is good for formatting output.
+
+### Help menu
+
+```
+vmalertcli -h
+Usage of vmalertcli:
+  -action="groups": VMAlert action to take {groups|alerts|metrics|reload}
+  -host="localhost": Host where VMAlert responds
+  -port=8880: VMAlert port
+```
+
+### Installation 
+
+Put binary in $PATH (release will be updated).
+
+### Usage
+
+View alert groups:
+```
+vmalertcli -action groups | jq
+```
+
+View VMAlert metrics:
+```
+vmalertcli -action metrics
+```
+
+Hot-reload VMAlert configuration:
+```
+vmalertcli -action reload
+```
+
+View active (firing) alerts:
+```
+vmalertcli -action alerts
+```