add selenium CDP example

selenium/README.md

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+# Selenium examples using CDP
+
+## Prerequisites
+
+```
+$ pip install trio selenium
+```

selenium/cdp.py

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+import trio
+import sys
+import logging
+from selenium import webdriver
+from selenium.webdriver.common.by import By
+
+logger = logging.getLogger('selenium')
+logger.setLevel(logging.DEBUG)
+
+handler = logging.StreamHandler(sys.stderr)
+logger.addHandler(handler)
+
+logging.getLogger('selenium.webdriver.remote').setLevel(logging.WARN)
+logging.getLogger('selenium.webdriver.common').setLevel(logging.DEBUG)
+
+async def run(driver):
+    async with driver.bidi_connection() as session:
+        await trio.to_thread.run_sync(lambda: driver.get('https://blg.tch.re'))
+
+        links = driver.find_elements(By.TAG_NAME, 'a')
+
+        for a in links:
+            print(a.get_attribute("href"))
+
+options = webdriver.ChromeOptions()
+options.page_load_strategy = 'normal'
+options.enable_bidi = True
+options.add_experimental_option("debuggerAddress", "127.0.0.1:9222")
+
+driver = webdriver.Chrome(options)
+
+trio.run(run, driver)