adding mocks and examples

examples/multifilter/README.md

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+# Multi-Filter
+
+The `multifilter` example demonstrates how to use the `multifilter`. The `multifilter` effectively is the same as using
+multiple `patcher.WithWhere` filters, but it is more efficient and potentially more readable.

examples/multifilter/main.go

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+package main
+
+import (
+	"fmt"
+
+	"github.com/jacobbrewer1/patcher"
+)
+
+type ExampleFilter struct {
+	Field string
+	Value any
+}
+
+func (e ExampleFilter) Where() (string, []any) {
+	return fmt.Sprintf("%s = ?", e.Field), []any{e.Value}
+}
+
+func main() {
+	// Create example filters
+	filters := []ExampleFilter{
+		{Field: "name", Value: "John"},
+		{Field: "age", Value: 30},
+	}
+
+	mf := patcher.NewMultiFilter()
+
+	// Append each filter to the WHERE clause
+	for _, filter := range filters {
+		mf.Add(filter)
+	}
+
+	// Print the WHERE clause
+	sql, args := mf.Where()
+	fmt.Printf("WHERE SQL:\n%s\n", sql)
+	fmt.Printf("WHERE Args: %v\n", args)
+}