Add example, analysis opts, etc.

jael_web/analysis_options.yaml

@@ -0,0 +1,3 @@
+analyzer:
+  strong-mode:
+    implicit-casts: false

jael_web/example/main.dart

@@ -0,0 +1,3 @@
+import 'package:jael_web/jael_web.dart';
+
+void main() {}

jael_web/lib/jael_web.dart

@@ -0,0 +1 @@
+export 'src/dom_builder.dart';

jael_web/lib/src/dom_builder.dart

@@ -1,9 +1,14 @@
 abstract class DomBuilder<T> {
-  DomBuilderElement<T> open(String tagName);
+  DomBuilderElement<T> append(
+      String tagName, void Function(DomBuilderElement<T>) f);
 
-  void emitText(String value);
+  void text(String value);
 }
 
-abstract class DomBuilderElement<T> implements DomBuilder<T> {
+abstract class DomBuilderElement<T> extends DomBuilder<T> {
+  void attr(String name, [String value]);
+
+  void attrs(Map<String, String> map);
+
   T close();
 }

jael_web/pubspec.yaml

@@ -11,3 +11,4 @@ dependencies:
 dev_dependencies:
   build_runner: ^1.0.0
   build_web_compilers: ^1.0.0
+  pedantic: ^1.0.0