docs(grafana/k6): add README

grafana/k6/README.md

@@ -0,0 +1,63 @@
+# POSH k6 provider
+
+## Usage
+
+### Plugin
+
+```go
+package main
+
+type Plugin struct {
+  l        log.Logger
+  op       *onepassword.OnePassword
+  commands command.Commands
+}
+
+func New(l log.Logger) (plugin.Plugin, error) {
+  inst := &Plugin{
+    l:        l,
+    cache:    &cache.MemoryCache{},
+    commands: command.Commands{},
+  }
+
+  // ...
+
+  if value, err := onepassword.New(l, inst.cache); err != nil {
+    return nil, err
+  } else {
+    inst.op = value
+  }
+
+  // ...
+
+  inst.commands.MustAdd(k6.NewCommand(l, inst.op))
+
+  // ...
+
+  return inst, nil
+}
+```
+
+### Config
+
+```yaml
+k6:
+  path: ./devtools/k6
+  envs:
+    dev:
+      URL: https://quickpizza.grafana.com
+```
+
+### Ownbrew
+
+To install binary locally, add:
+
+```yaml
+ownbrew:
+  packages:
+    # https://github.com/grafana/k6/releases
+    - name: k6
+      tap: foomo/tap/grafana/k6
+      version: 1.2.2
+```
+