Adding installation and usage commands in readme

Author: Shailee Mehta

README.md

@@ -1,2 +1,45 @@
 # quasar-q-select-group
+
 Multi-select component with option groups for the Quasar Framework (Vue.js)
+
+# Installation
+
+`npm i --save q-select-group`
+
+# Usage
+
+```
+import QSelectGroup from "q-select-group";
+...
+ components: {
+    QSelectGroup,
+  },
+...
+<q-select-group
+    :model="value"
+    @update:model="(v) => $emit('input', v)"
+    v-bind="$attrs"
+    v-on="$listeners"
+    :string-options="options"
+  />
+```
+
+This component accept all attributes, listeners accepted by Quasar's QSelect component.
+
+Props:
+options: Array of list
+model: it is the input value. (can also use model.sync)
+multiple: Boolean, specifies whether component accepts multiple values
+disabled: Boolean, specifies whether component is disabled
+
+# Publish
+
+## Add user to npm
+`npm adduser`
+
+## Login and verify
+`npm login`
+
+## Publish
+`npm run build`
+`npm publish`