Populate README.

README

@@ -0,0 +1,14 @@
+fasmtags is tags [1] file generator for fasm [2] (flat assembler, fasm1).
+
+Unlike universal-ctags [3], fasmtags parses not source code but symbols file
+generated from debug file generated from source.
+
+[1] http://ctags.sourceforge.net/FORMAT
+[2] https://flatassembler.net/
+[3] https://ctags.io/
+
+Example usage:
+  $ fasm blah.asm -s blah.fas
+  $ symbols blah.fas blah.sym       # symbols utility comes with fasm
+  $ fasmtags.py blah.sym            # produces tags file
+  $ vim blah.asm                    # enjoy!