Create README.md

Author: yabwon

README.md

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+## `dfa` - *Dynamic Function Arrays* and other useful data structures for data step.
+
+---
+
+The **DFA** (Dynamic Function Arrays) package contains set of macros and FCMP functions which implement: 
+a dynamically allocated array, a stack, a fifo queue, an ordered stack, and a priority queue. 
+
+Run `%helpPackage(DFA,createDFArray)` to find examples.
+
+SHA256 digest for the latest version of `DFA`: 5A6FD2F6E962E6C191346A141FFAF354E35A546CA93146B55D7C6163BFB1BDD6
+
+[**Documentation for DFA**](./dfa.md "Documentation for DFA")
+