Add serve docs

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: junjiejiangjjj

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[codecov[bot]]

Codecov Report

Patch coverage: 83.87% and project coverage change: +0.01 :tada:

Comparison is base (4f76c1d) 75.78% compared to head (e2a0102) 75.79%.

:exclamation: Current head e2a0102 differs from pull request most recent head 056d093. Consider uploading reports for the commit 056d093 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2602 +/- ## ========================================== + Coverage 75.78% 75.79% +0.01% ========================================== Files 387 387 Lines 20545 20558 +13 Branches 2746 2747 +1 ========================================== + Hits 15570 15582 +12 - Misses 4087 4088 +1 Partials 888 888 ``` | [Impacted Files](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io) | Coverage Δ | | |---|---|---| | [towhee/serve/api\_service.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2FwaV9zZXJ2aWNlLnB5) | `96.00% <ø> (ø)` | | | [towhee/serve/io/bytes\_io.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2lvL2J5dGVzX2lvLnB5) | `100.00% <ø> (ø)` | | | [towhee/serve/io/json\_io.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2lvL2pzb25faW8ucHk=) | `100.00% <ø> (ø)` | | | [towhee/serve/io/ndarray\_io.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2lvL25kYXJyYXlfaW8ucHk=) | `80.55% <ø> (ø)` | | | [towhee/serve/io/text\_io.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2lvL3RleHRfaW8ucHk=) | `75.00% <66.66%> (ø)` | | | [towhee/serve/http/server.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2h0dHAvc2VydmVyLnB5) | `88.63% <77.77%> (-8.67%)` | :arrow_down: | | [towhee/serve/grpc/server.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2602?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL3NlcnZlL2dycGMvc2VydmVyLnB5) | `90.14% <100.00%> (+5.52%)` | :arrow_up: |

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[Chiiizzzy]

/lgtm