Create README.md

Author: yabwon

README.md

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+### `macroArray` - Macroarrays for macro codes
+
+---
+
+The **macroArray** package implements an array, a hash table, and a dictionary concept in macrolanguage. For example:
+```sas
+  %array(ABC[17] (111:127), macarray=Y); 
+  
+  %macro test();
+    %do i = 1 %to 17; 
+      %put &i.) %ABC(&i.); 
+    %end;
+  %mend;
+  %test() 
+  
+  %let %ABC(13,i) = 99999; /* i = insert */
+
+  %do_over(ABC, phrase=%nrstr( 
+      %put &_i_.%) %ABC(&_i_.); 
+      ),
+      which = 1:H:2
+  );
+```
+
+SHA256 digest for the latest version of `macroArray`: 371B92A5ABBE82C53F7D63BC5C0D1EBD4695603D3894D8A9A5D5777D1AB59B30
+
+[**Documentation for macroArray**](./macroarray.md "Documentation for macroArray")
+
+
+