Update readme

README.md

@@ -1,2 +1,20 @@
 # query-string-content-shortcode
- Provides a shortcode to retrieve any query string from the url and display it or display content if specified value is set.
+Provides a shortcode to retrieve any query string from the url and display it or display content if specified value is set.
+
+HOW TO USE THIS SHORTCODE PLUGIN
+Specify a field and value to return content or specify just a field to return a value. Alternatively, find a value or field from the query string and return the content.
+
+EXAMPLE 1 
+URL: example.com/home/?city=Perth 
+SHORTCODE: [query_string_content field="city" value="Perth"]The text will display[/query_string_content] 
+RESULT: The text will display
+
+EXAMPLE 2 
+URL: example.com/home/?city=Perth 
+SHORTCODE: [query_string_content field="city"][/query_string_content] 
+RESULT: Perth
+
+EXAMPLE 3 
+URL: example.com/home/?city=Perth 
+SHORTCODE: [query_string_content find="Perth"]Yes, the string was found[/query_string_content] 
+RESULT: Yes, the string was found