Update README.md

README.md

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-# sdp
+# SDP
 SQL-driven programming
+
+The SDP is a tool for generate source code, which base on SpringBoot and Mybatis.
+
+The backend of SDP based on Mybatis generator plugin https://github.com/mybatis/generator.
+The front end of SDP based on https://github.com/chuzhixin/vue-admin-beautiful-pro.
+
+# SDP template language
+SDP use template to generate source file.
+The tempalate is very simple: without IF, without for. Only support two style:block and element.
+The block is just like {*xxx}, and the element just like {yyy}.
+Block is asa 'FOR' in other source code generate tool.