Improve documentation

README.md

@@ -3,9 +3,29 @@
 
 # pgconn
 
-Package pgconn is a low-level PostgreSQL database driver.
+Package pgconn is a low-level PostgreSQL database driver. It operates at nearly the same level is the C library libpq.
+It is primarily intended to serve as the foundation for higher level libraries such as https://github.com/jackc/pgx.
+Applications should handle normal queries with a higher level library and only use pgconn directly when required for
+low-level access to PostgreSQL functionality.
 
-It is intended to serve as the foundation for the next generation of https://github.com/jackc/pgx.
+## Example Usage
+
+```go
+pgConn, err := pgconn.Connect(context.Background(), os.Getenv("DATABASE_URL"))
+if err != nil {
+	log.Fatalln("pgconn failed to connect:", err)
+}
+defer pgConn.Close()
+
+result := pgConn.ExecParams(context.Background(), "select email from users where id=$1", [][]byte{[]byte("123")}, nil, nil, nil)
+for result.NextRow() {
+	fmt.Println("User 123 has email:", string(result.Values()[0]))
+}
+_, err := result.Close()
+if err != nil {
+	log.Fatalln("failed reading result:", err)
+})
+```
 
 ## Testing