[Optimize]The description of linkis project

[casionone]

As discussed in other projects https://lists.apache.org/thread/m1dhqb15wtb8o01jnw5556p9181ls894, The description of the project needs to be as simple and accurate as possible

Linkis builds a computation middleware layer to decouple the upper applications and the underlying data engines, provides 
standardized interfaces (REST, JDBC, WebSocket etc.) to easily connect to various underlying engines (Spark, Presto, Flink, etc.), while 
enables cross engine context sharing, unified job& engine governance and orchestration.

Linkis 在上层应用和底层引擎之间构建了一层计算中间件。通过使用Linkis 提供的REST/WebSocket/JDBC 等标准接口，上层应用可以方
便地连接访问Spark, Presto, Flink 等底层引擎,同时实现跨引擎上下文共享、统一的计算任务和引擎治理与编排能力。

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