update readme.md

README.md

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-# visa32test
+# visa32test.js
+
+ VISA32TEST.JS
+
+visa32test.js is a prototype for using VISA ( Virtual Instrument Software Architechture) library in node.js.
+This is a wrapper for visa32.dll ( in your system32 folder).
+I tested this code on Windows 7 (32bit), Keysight IO Library (17.1), node.js(0.10.26) .
+Please test on your insturment (e.g. GPIB, RS232, LAN etc...) and fork me, and develop complete VISA module. (like pyVISA)
+
+
+to use...
+
+> npm install ffi
+> npm install ref
+> npm install ref-array
+> node visa32test.js
+
+Author : 7M4MON
+Licence : MIT