feat: add avatar component

[vtrbo]

• add avatar component
• add avatar docs

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[wangyewei]

looks like there is an extra space in the class name.:

you can use the createCls function to solve it:

import { createCls, getPrefixCls } from '@ikun-ui/utils'

const prefixCls = getPrefixCls('avatar')
$: cnames = createCls(prefixCls, cls)

<div class={cnames}></div>

[wangyewei]

looks like there is an extra space in the class name:

you can use the createCls function to solve it:

import { createCls, getPrefixCls } from '@ikun-ui/utils'

const prefixCls = getPrefixCls('avatar')
$: cnames = createCls(prefixCls, cls)

<div class={cnames}></div>

the same problem exists in the other pull requests.
cc/ @baiwusanyu-c

[vtrbo]

looks like there is an extra space in the class name.: you can use the createCls function to solve it:

import { createCls, getPrefixCls } from '@ikun-ui/utils'

const prefixCls = getPrefixCls('avatar')
$: cnames = createCls(prefixCls, cls)

<div class={cnames}></div>

ok, i fix it.