Added icons

Updated README.md
Started test framework utils

tests/test_commands.py

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+import pytest
+
+from myfasthtml.core.commands import Command, CommandsManager
+
+
+def callback():
+  return "Hello World"
+
+
+@pytest.fixture(autouse=True)
+def test_reset_command_manager():
+  CommandsManager.reset()
+
+
+def test_i_can_create_a_command_with_no_params():
+  command = Command('test', 'Command description', callback)
+  assert command.id is not None
+  assert command.name == 'test'
+  assert command.description == 'Command description'
+  assert command.execute() == "Hello World"
+
+
+def test_command_are_registered():
+  command = Command('test', 'Command description', callback)
+  assert CommandsManager.commands.get(str(command.id)) is command