Update readmes, requirements, packagejsons, etc for all examples (#1452)

Most of the examples needed updates of Readmes to show how to run them. Some of the requirements.txt files had extra content that wasn't needed, or missing altogether. Apparently some folks like to run npm start
to run typescript, so a script was added to all typescript examples which
hadn't been done before.

Basically just a lot of cleanup.

Signed-off-by: Matt Williams <m@technovangelist.com>

examples/python-simplechat/client.py

@@ -24,7 +24,6 @@ def chat(messages):
             # the response streams one token at a time, print that as we receive it
             print(content, end="", flush=True)
 
-
         if body.get("done", False):
             message["content"] = output
             return message
@@ -32,9 +31,11 @@ def chat(messages):
 
 def main():
     messages = []
-    
+
     while True:
         user_input = input("Enter a prompt: ")
+        if not user_input:
+            exit()
         print()
         messages.append({"role": "user", "content": user_input})
         message = chat(messages)