Update README.md

README.md

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 # go-func
-Provide functional programming interface in golang
+<p>提供针对Golang的函数式编程接口</p>
+<p>Provide functional programming interface in golang</p>
+
+使用指南:
+<p>1.引入工具包:</p>
+<p><code>import . "github.com/go-func/stream"</code></p>
+<p>2.使用<code>NewSteam</code>或者<code>NewParallelStream</code>函数开启数据流</p>
+<p>3.然后追加流操作函数以修改数据</p>
+<p>4.使用如Collect、Reduce等流终结操作函数拿到处理结果集</p>
+注意：
+<p>本工具包提供的并发数据流在处理压力较低或者单核机器上时，并发处理为负优化，请斟酌选择是否并发</p>
+<hr>
+Usage:
+<p>1.import package:</p>
+<p><code>import . "github.com/go-func/stream"</code></p>
+<p>2.Start steam with function <code>NewSteam</code> or <code>NewParallelStream</code></p>
+<p>3.Append operation function to modify element in stream</p>
+<p>4.Terminate stream with any termination operation like Collect,Reduce,etc. </p>
+Notice:
+<p>The ParallelStream provided by this toolkit may result in negative optimization when meeting low processing pressure or on a single-core machine. Please choose whether or not to use</p>