add readme

README.md

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+# Utilities
+
+General helper functions
+
+```
+const util = require('@scode/utilities');
+
+// cut off decimal places to a specified point
+util.truncate_decimal(12.345678, 2);
+// returns 12.34
+
+// will return null instead of throwing on invalid json
+util.try_parse_json('{{foo');
+```