Update README.md

Author: Dharin-shah

packages/opentelemetry/README.md

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+# Appium Opentelemetry Plugin
+
+With Appium 2.0, we can now use opentelemetry as observability tool without bundling it with appium main server
+
+This plugin will help generate http traces automatically once used and also allow dynamic configurations for different exporters such as prometheus, jaeger, zipkin or just basic console logs.
+
+## Installation - Server
+
+Install the plugin using Appium's plugin CLI, either as a named plugin or via NPM (TODO):
+
+```
+appium plugin install opentelemetry
+appium plugin install --source=npm @browserstack/opentelemetry-plugin
+```
+
+Install the plugin using Appium's plugin CLI, locally:
+
+```
+appium plugin install <path-to-repo>/packages/opentelemetry --source local
+```
+
+## Activation
+
+The plugin will not be active unless turned on when invoking the Appium server:
+
+```
+appium --plugins=opentelemetry
+```