[Source] Add directory and README.

A new element for NNStreamer is drafted in the architecture document.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

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+# NNStreamer::tensor_source
+
+## Motivation
+
+Allow non Gstreamer standard input sources to provide other/tensor stream.
+
+Such sources include, but not limited to:
+
+- Output of general external applications including instances of nerual network frameworks and models not using NNStreamer suite.
+- Output of non gstreamer compatible sensors, such as Linux IIO devices: [Industrial I/O, 01.org](https://01.org/linuxgraphics/gfx-docs/drm/driver-api/iio/index.html). We may need to get streams from thermostats, light detectors, IMUs, or signals from GPIO pins.
+- Output of LIDAR and RADAR in case we do not have V4L2 interfaces for them.
+
+
+## Output Format (src_pad)
+
+other/tensor