Audio: TDFB: Tune: Add a README file

This patch adds a README.md file that explains how various
blob generate scrips are used.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

src/audio/tdfb/tune/README.md

@@ -0,0 +1,41 @@
+# Settings blobs generators for TDFB
+
+This directory contains the scripts to generate settings blobs for
+the time-domain fixed beamformer (TDFB) for various microphone array
+geometries and beamformer features.
+
+The requirement is Octave or Matlab with signal processing package.
+
+The most straightforward way to generate all blobs for topologies,
+sof-ctl and UCM is to run command
+
+```
+./sof_example_all.sh
+```
+
+It creates the blobs for passthrough mode, single beam blobs for
+line and circular arrays, and dual beam blobs for stereo audio
+capture. Running it can take about 30 minutes.
+
+All the topology ASCII text format blobs contain instructions
+how to generate them from command line shell. E.g. these
+commands do a more fine grained build.
+
+```
+cd $SOF_WORKSPACE/sof
+
+# Generate pass-through blobs
+cd tools/tune/tdfb; octave --no-window-system example_pass_config.m
+
+# Generate blobs for line array and single beam
+cd tools/tune/tdfb; octave --no-window-system example_line_array.m
+
+# Generate blobs for stereo capture for arrays with known mm-spacing
+cd tools/tune/tdfb; matlab -nodisplay -nosplash -nodesktop -r example_two_beams
+
+# Generate bobs for stereo capture for generic arrays with known microphones count
+cd tools/tune/tdfb; matlab -nodisplay -nosplash -nodesktop -r example_two_beams_default
+```
+
+Further information about TDFB component is available in SOF Docs, see
+https://thesofproject.github.io/latest/algos/tdfb/time_domain_fixed_beamformer.html