Sample - add a new sample for processing multiple input files (#97)

* adding a sample for decoding multiple files

* readme correction

* spacing

* review comments

[ROCm/rocdecode commit: 2cb3bd143c]

projects/rocdecode/samples/videoDecodeMultiFiles/README.md

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+# Video Decode Multi Files Sample
+This sample illustrates the FFMPEG demuxer to get the individual frames which are then decoded on AMD hardware using rocDecode library.
+
+This sample takes multiple files as a list and decodes each of them one after the other.
+
+## Prerequisites:
+
+* Linux distribution
+  + Ubuntu - `20.04` / `22.04`
+
+* [ROCm supported hardware](https://rocm.docs.amd.com/en/latest/release/gpu_os_support.html)
+
+* Install [ROCm 5.5 or later](https://rocmdocs.amd.com/en/latest/deploy/linux/installer/install.html) with `--usecase=graphics,rocm --no-32`
+
+* rocDecode
+
+* CMake `3.5` or later
+
+* [FFMPEG](https://ffmpeg.org/about.html)
+  ```
+  sudo apt install ffmpeg
+  ```
+
+## Build
+```
+mkdir build
+cd build
+cmake ../
+make -j
+```
+# Run
+
+* Example input file list - example.txt
+
+```
+infile input1.[mp4/mov...] [required]
+outfile output1.yuv [optional]
+z 0 [optional]
+sei 0 [optional]
+crop l,t,r,b [optional]
+infile input2.[mp4/mov...] [optional]
+outfile output2.yuv [optional]
+...
+...
+```
+
+```
+./videodecodemultifiles -i <input file list[required - example.txt]>
+              -d <GPU device ID - 0:device 0 / 1:device 1/ ... [optional - default:0]>
+```