add requirements doc

Author: DQinYuan

README-EN-source.adoc

@@ -113,6 +113,11 @@ QLExpress4 supports omitting semicolons, making expressions more concise. For de
 </dependency>
 ----
 
+Requirements
+
+* JDK 8 or higher
+
+
 === First QLExpress Program
 
 [source,java,indent=0]

README-source.adoc

@@ -115,6 +115,10 @@ QLExpress4 支持省略分号，让表达式更加简洁。具体参考 link:#
 </dependency>
 ----
 
+环境要求：
+
+* JDK 8 或更高版本
+
 === 第一个 QLExpress 程序
 
 [source,java,indent=0]