add readme

Author: zawata

README.md

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+# @axosoft/dump-syms
+
+A thin node-js wrapper around [Mozilla/dump-syms](https://github.com/mozilla/dump-syms)
+
+### Build
+
+`yarn install`
+
+### Usage
+
+```
+const { dumpSymbol } = require('@axosoft/dump-syms');
+
+const symbols = dumpSymbol('/path/to/binary');
+```