tools: corpus: add seed corpus root

tools/corpus/README.md

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+# SOF Corpus Directory
+
+====================
+
+The following directory is a special directory containing binary transcripts of
+IPC messages from various devices. When OSS-Fuzz runs, it zips these files up
+into a output directory to be used as seed material for the fuzzers.
+
+Feel free to add more examples to this directory, more components and state
+coverage the better.
+
+## How to generate these files
+
+These files are generated by live dumping the IPC messages, the initial batch
+were created by adding a hook to write binary ipc window to the /tmp directory
+from the kernel every time a IPC TX occurred. These files were then
+concatenated together in order sent. A single file represents a single DSP
+lifecycle. If you inspect the data, you will be able to parse out each IPC at
+SOF_IPC_MSG_MAX_SIZE byte intervals.
+
+

tools/corpus/sof-ipc3/DELETE_ME

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+stub file until real data is added

tools/corpus/sof-ipc4/DELETE_ME

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+stub file until real data is added