feat(context): add BindQuery func (#1029)

* feat(context): add BindQuery func, only parse/bind the query string params.

* docs(readme): add BindQuery section.

* docs(readme): fix import.

* docs(readme): separate import

context_test.go

@@ -1186,6 +1186,22 @@ func TestContextBindWithJSON(t *testing.T) {
 	assert.Equal(t, w.Body.Len(), 0)
 }
 
+func TestContextBindWithQuery(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, _ := CreateTestContext(w)
+
+	c.Request, _ = http.NewRequest("POST", "/?foo=bar&bar=foo", bytes.NewBufferString("foo=unused"))
+
+	var obj struct {
+		Foo string `form:"foo"`
+		Bar string `form:"bar"`
+	}
+	assert.NoError(t, c.BindQuery(&obj))
+	assert.Equal(t, "foo", obj.Bar)
+	assert.Equal(t, "bar", obj.Foo)
+	assert.Equal(t, 0, w.Body.Len())
+}
+
 func TestContextBadAutoBind(t *testing.T) {
 	w := httptest.NewRecorder()
 	c, _ := CreateTestContext(w)