readme: added websearch (#76)

plugins/websearch/README.md

@@ -0,0 +1,18 @@
+# Websearch
+
+Search with your preferred search-engine. You can configure multiple engines.
+
+## Usage
+
+Enter your search-term and select the resulting search action you want to perform.
+
+## Configuration
+
+Default config
+
+```
+Config(
+  prefix: "?",
+  engines: [Google] // options: Google, Ecosia, Bing, DuckDuckGo
+)
+```