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添加1002.查找常用字符 Ruby实现

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`@@ -518,6 +518,54 @@ impl Solution {`
`518`	`518`	`}`
`519`	`519`	```
`520`	`520`
	`521`	`+Ruby:`
	`522`	+```ruby
	`523`	`+def common_chars(words)`
	`524`	`+ result = []`
	`525`	`+ #统计所有字符串里字符出现的最小频率`
	`526`	`+ hash = {}`
	`527`	`+ #初始化标识`
	`528`	`+ is_first = true`
	`529`	`+`
	`530`	`+ words.each do \|word\|`
	`531`	`+ #记录共同字符`
	`532`	`+ chars = []`
	`533`	`+ word.split('').each do \|chr\|`
	`534`	`+ #第一个字符串初始化`
	`535`	`+ if is_first`
	`536`	`+ chars << chr`
	`537`	`+ else`
	`538`	`+ #字母之前出现过的最小次数`
	`539`	`+ if hash[chr] != nil && hash[chr] > 0`
	`540`	`+ hash[chr] -= 1`
	`541`	`+ chars << chr`
	`542`	`+ end`
	`543`	`+ end`
	`544`	`+ end`
	`545`	`+`
	`546`	`+ is_first = false`
	`547`	`+ #清除hash,更新字符最小频率`
	`548`	`+ hash.clear`
	`549`	`+ chars.each do \|chr\|`
	`550`	`+ if hash[chr] != nil`
	`551`	`+ hash[chr] += 1`
	`552`	`+ else`
	`553`	`+ hash[chr] = 1`
	`554`	`+ end`
	`555`	`+ end`
	`556`	`+ end`
	`557`	`+`
	`558`	`+ #字符最小频率hash转换为字符数组`
	`559`	`+ hash.keys.each do \|key\|`
	`560`	`+ for i in 0..hash[key] - 1`
	`561`	`+ result << key`
	`562`	`+ end`
	`563`	`+ end`
	`564`	`+`
	`565`	`+ return result`
	`566`	`+end`
	`567`	+```
	`568`	`+`
`521`	`569`	`<p align="center">`
`522`	`570`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`
`523`	`571`	`<img src="../pics/网站星球宣传海报.jpg" width="1000"/>`

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