added a readme

Author: itzandroidtab

readme.md

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+# ELFdwt
+Open source implementation of the program `ELFDwT` that is included in the Keil uVision tool package. 
+
+This tool was created with information from the document `LPC Boot ROM checksum` from the NXP community page ([this document](https://community.nxp.com/pwmxy87654/attachments/pwmxy87654/lpc%40tkb/163/1/LPC%20Boot%20ROM%20checksum.pdf))
+
+> :warning: **Currently only targets with little endian are supported**