Added icons

Updated README.md
Started test framework utils

tests/test_integration_commands.py

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+from fasthtml.fastapp import fast_app
+
+from myfasthtml.controls.button import mk_button
+from myfasthtml.core.commands import Command
+from myfasthtml.core.testclient import MyTestClient
+
+
+def new_value(value):
+  return value
+
+
+command = Command('test', 'TestingCommand', new_value, "this is my new value")
+
+
+def test_i_can_trigger_a_command():
+  test_app, rt = fast_app(default_hdrs=False)
+  user = MyTestClient(test_app)
+  
+  @rt('/')
+  def get(): return mk_button('button', command)
+  
+  user.open("/")
+  user.should_see("button")
+  b = user.find_element("button")
+  b.click()
+  user.should_see("this is my new value")