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Currently, we provider Go, Cpp and Java client examples, maybe we need to provide examples of other language clients

• Python #25
• nodejs #25
• pulsar-admin #25
• pulsarctl #25
  • token
  • oauth2
• ruby
• c#
• websocket
• rust
• pulsar-perf(pulsar-client) #25

The delay messages can have different delay time levels such as 1s 1min 10min 1h, for the best practice, if we have many delayed messages with different delay time levels, it's better to place messages with a similar delay time to a partition.
So, it's better to provide a producer demo for how to route delayed messages to partitions based on the delayed time.

Currently, Users can use g++ to successfully compile the code, but it may not be very user-friendly, we can try to use cmake to build, this issue will be used to track this task.

https://github.com/streamnative/pulsar-examples/pull/30/files#r466933861

We should update the README of this repo to include all the cloud examples.

The issue_url in the current cpp example needs to be suffixed with oauth/token, otherwise it cannot be recognized correctly and the following error will be returned:

OAuth2 auth data: 2020-08-10 15:21:06.117 ERROR [0x10ff855c0] AuthOauth2:243 | Response failed for issuerurl https://auth.test.cloud.gcp.streamnative.dev/oauth2/token. response Code 404 passedin: {
    "grant_type": "client_credentials",
    "client_id": "xxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "client_secret": "xxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "audience": "urn:sn:pulsar:pi-ns:pi-name"
}

libc++abi.dylib: terminating with uncaught exception of type char const*

e.g:

"issuer_url": "https://cloud.streamnative.dev/oauth/token",