add readme for each package

README.md

@@ -0,0 +1,91 @@
+# Go Arango
+
+This package offers a simple syntax to construct [AQL queries](https://docs.arangodb.com/3.11/aql/) with bind parameters, which can be used with the [official ArangoDB driver](https://pkg.go.dev/github.com/arangodb/go-driver).
+
+While it's entirely possible to write static queries and bind parameters externally, sometimes you need more flexibility to create queries, particularly if you are providing a consumer API with querying capabilities. See also:
+
+- [Go Query String](../qs/README.md)
+- [Go REST](../rest/README.md)
+
+This package allows you to build your query piece-by-piece and attach parameters in whatever way serves you best.
+
+> :warning: This package has not yet been tested with the [v2 driver](https://pkg.go.dev/github.com/arangodb/go-driver/v2/arangodb).
+
+## Examples
+
+In this example, the `tastiness` value is bound to a parameter _while_ constructing the query.
+
+```go
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+
+	"github.com/annybs/go/arango"
+)
+
+func main() {
+	query := arango.NewQuery().Append("FOR f IN @@foodColl", "food")
+
+	tastiness := 1
+	if len(os.Args) > 1 {
+		t, err := strconv.Atoi(os.Args[1])
+		if err != nil {
+			fmt.Println(errors.New("invalid minimum tastiness"))
+			os.Exit(1)
+		}
+		tastiness = t
+	}
+
+	query.
+		Append("FILTER f.tastiness > @tastiness", tastiness).
+		Append("RETURN f")
+
+	fmt.Println("Query:", query.String())
+	fmt.Println("Params:", query.Params)
+}
+```
+
+For simpler cases, you may prefer to construct your query first and then bind parameters separately:
+
+```go
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+
+	"github.com/annybs/go/arango"
+)
+
+func main() {
+	query := arango.NewQuery().
+		Append("FOR f IN @@foodColl", "food").
+		Append("FILTER f.tastiness > @tastiness").
+		Append("RETURN f")
+
+	tastiness := 1
+	if len(os.Args) > 1 {
+		t, err := strconv.Atoi(os.Args[1])
+		if err != nil {
+			fmt.Println(errors.New("invalid minimum tastiness"))
+			os.Exit(1)
+		}
+		tastiness = t
+	}
+
+	query.Bind("tastiness", tastiness)
+
+	fmt.Println("Query:", query.String())
+	fmt.Println("Params:", query.Params)
+}
+```
+
+## License
+
+See [LICENSE.md](../LICENSE.md)