feat: add chat streaming method examples (start/append/stop)

methods/README.md

@@ -18,4 +18,7 @@ $ slack run chat_post_message.py  # Make the request
 
 ### chat
 
+- **[chat.appendStream](https://docs.slack.dev/reference/methods/chat.appendStream)**: Appends text to an existing streaming conversation. [Implementation](./src/chat/chat_append_stream.py).
 - **[chat.postMessage](https://docs.slack.dev/reference/methods/chat.postmessage)**: Sends a message to a channel. [Implementation](./src/chat/chat_post_message.py).
+- **[chat.startStream](https://docs.slack.dev/reference/methods/chat.startStream)**: Starts a new streaming conversation. [Implementation](./src/chat/chat_start_stream.py).
+- **[chat.stopStream](https://docs.slack.dev/reference/methods/chat.stopStream)**: Stops a streaming conversation. [Implementation](./src/chat/chat_stop_stream.py).

methods/src/chat/chat_append_stream.py

@@ -0,0 +1,19 @@
+import os
+
+from slack_sdk import WebClient
+
+# Read a token from an environment variable
+token = os.environ.get("SLACK_TOKEN")
+
+# Initialize
+client = WebClient(token=token)
+
+# Call the chat.appendStream method
+response = client.chat_appendStream(
+    channel="C123ABC456",
+    ts="1234567890.123456",
+    markdown_text=" — reading the logs now",
+)
+
+# Inspect the response
+print(response)

methods/src/chat/chat_start_stream.py

@@ -0,0 +1,19 @@
+import os
+
+from slack_sdk import WebClient
+
+# Read a token from an environment variable
+token = os.environ.get("SLACK_TOKEN")
+
+# Initialize
+client = WebClient(token=token)
+
+# Call the chat.startStream method
+response = client.chat_startStream(
+    channel="C123ABC456",
+    thread_ts="1234567890.123456",
+    markdown_text="Let me look into that",
+)
+
+# Inspect the response
+print(response)

methods/src/chat/chat_stop_stream.py

@@ -0,0 +1,18 @@
+import os
+
+from slack_sdk import WebClient
+
+# Read a token from an environment variable
+token = os.environ.get("SLACK_TOKEN")
+
+# Initialize
+client = WebClient(token=token)
+
+# Call the chat.stopStream method
+response = client.chat_stopStream(
+    channel="C123ABC456",
+    ts="1234567890.123456",
+)
+
+# Inspect the response
+print(response)