Improve readme

Author: puzpuzpuz

README.md

@@ -9,7 +9,7 @@ Golang client for QuestDB's [Influx Line Protocol](https://questdb.io/docs/refer
 The library requires Go 1.19 or newer.
 
 Features:
-* Context-aware API.
+* [Context](https://www.digitalocean.com/community/tutorials/how-to-use-contexts-in-go)-aware API.
 * Optimized for batch writes.
 * Supports TLS encryption and ILP authentication.
 * Automatic write retries and connection reuse for ILP over HTTP.
@@ -43,23 +43,40 @@ func main() {
 	}
 	// Make sure to close the sender on exit to release resources.
 	defer sender.Close(ctx)
+
 	// Send a few ILP messages.
+	tradedTs, err := time.Parse(time.RFC3339, "2022-08-06T15:04:05.123456Z")
+	if err != nil {
+		log.Fatal(err)
+	}
 	err = sender.
-		Table("trades").
-		Symbol("name", "test_ilp1").
-		Float64Column("value", 12.4).
-		AtNow(ctx)
+		Table("trades_go").
+		Symbol("pair", "USDGBP").
+		Symbol("type", "buy").
+		Float64Column("traded_price", 0.83).
+		Float64Column("limit_price", 0.84).
+		Int64Column("qty", 100).
+		At(ctx, tradedTs)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	tradedTs, err = time.Parse(time.RFC3339, "2022-08-06T15:04:06.987654Z")
 	if err != nil {
 		log.Fatal(err)
 	}
 	err = sender.
-		Table("trades").
-		Symbol("name", "test_ilp2").
-		Float64Column("value", 11.4).
-		At(ctx, time.Now().UnixNano())
+		Table("trades_go").
+		Symbol("pair", "GBPJPY").
+		Symbol("type", "sell").
+		Float64Column("traded_price", 135.97).
+		Float64Column("limit_price", 0.84).
+		Int64Column("qty", 400).
+		At(ctx, tradedTs)
 	if err != nil {
 		log.Fatal(err)
 	}
+
 	// Make sure that the messages are sent over the network.
 	err = sender.Flush(ctx)
 	if err != nil {