add examples folder

examples/openaichat.py

@@ -0,0 +1,23 @@
+from g4f.client   import Client
+from g4f.Provider import OpenaiChat, RetryProvider
+
+# compatible countries: https://pastebin.com/UK0gT9cn
+client = Client(
+    proxies = {
+        'http': 'http://username:password@host:port', # MUST BE WORKING OPENAI COUNTRY PROXY ex: USA
+        'https': 'http://username:password@host:port' # MUST BE WORKING OPENAI COUNTRY PROXY ex: USA
+    },
+    provider = RetryProvider([OpenaiChat],
+                             single_provider_retry=True, max_retries=5)
+)
+
+messages = [
+    {'role': 'user', 'content': 'Hello'}
+]
+
+response = client.chat.completions.create(model='gpt-3.5-turbo',
+                                     messages=messages, 
+                                     stream=True)
+
+for message in response:
+    print(message.choices[0].delta.content or "")