Add tool for producing .1337 patches

win/tools/1337-diff/README.md

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+1337-diff
+=========
+
+This tool accepts two input files and produces patch (diff) in `.1337`-file format. This format is compatible with patches produced by [x64dbg](https://x64dbg.com/) and applied by [Win\_1337\_Apply\_Patch tool](https://github.com/Deltafox79/Win_1337_Apply_Patch).
+
+This tool is intended for internal usage to automate routine tasks related to windows patches. Implementation is really slow and prefers code transparency and correctness over speed.
+
+## Requirements
+
+* Python 3
+
+## Synopsys
+
+```
+$ ./1337-diff.py -h
+usage: 1337-diff.py [-h] [-f FILENAME] [-l LIMIT]
+                    ORIG_FILE PATCHED_FILE [OUTPUT_FILE]
+
+Make .1337 patch file from original and patched files
+
+positional arguments:
+  ORIG_FILE             original file
+  PATCHED_FILE          patched file
+  OUTPUT_FILE           filename for patch output. Default: basename of
+                        original filename with .1337 extension
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -f FILENAME, --header-filename FILENAME
+                        filename specified in resulting patch header. Default:
+                        basename of original filename.
+  -l LIMIT, --limit LIMIT
+                        stop after number of differences
+```
+
+## Example
+
+```
+$ ./1337-diff.py ~/w418.81/orig/nvcuvid.dll ~/w418.81/patched/nvcuvid.dll 
+$ cat nvcuvid.1337 
+>nvcuvid.dll
+00000000000DE736:74->90
+00000000000DE737:08->90$
+```
+
+Note no newline at the end of file and CRLF line breaks.