coredump-reader: add README

Signed-off-by: Adrian Bonislawski <adrian.bonislawski@linux.intel.com>

tools/README

@@ -103,6 +103,33 @@ Examples:
   $ sof-logger -l ldc_file -i trace_dump -o out_file -c 19.9
 
 
+sof-coredump-reader
+===================
+
+Tool for processing FW stack dumps. In verbose mode it prints the stack leading
+to the core dump including DSP registers and function calls.
+It outputs unwrapped gdb command function call addresses to human readable
+function call format either to a file or stdout.
+
+Usage sof-coredump-reader.py [-h] [-a ARCH] [-c] [-l COLUMNCOUNT] [-v]
+				(--stdout | -o OUTFILE) [--stdin | -i INFILE]
+
+-h			show this help message and exit
+-a ARCH			determine architecture of dump file; valid archs are: LE64bit, LE32bit
+-c			set output to be colourful
+-l COLUMNCOUNT		set how many colums to group the output in
+-v			increase output verbosity
+--stdin			input is from stdin
+-i INFILE		path to sys dump bin
+--stdout		output is to stdout
+-o OUTFILE		output is to FILE
+
+sof-coredump-to-gdb.sh shows example usage of sof-coredump-reader.py
+We read from dump file into sof-coredump-reader.py,
+then we pipe its output to xt-gdb, which operates on given elf-file.
+
+  $ ./sof-coredump-to-gdb.sh sof-apl dump_file
+
 tests
 =====