vpu: Generic: Add metadata and documentation

Signed-off-by: Abdur Rehman <abdur.rehman@toradex.com>

README.md

@@ -33,3 +33,7 @@ For more details about each sample metadata, please check the [samples.json](sam
   Sample showing an example using Tensorflow Lite with hardware acceleration 
   on the IMX8 SoCs with Vivante GPU. 
   Examples available in Python.
+
+- **vpu:**
+  Sample showing an example of using VPU on i.MX8 for encoding and decoding
+  Example available as a generic Dockerfile.

samples.json

@@ -58,5 +58,13 @@
             "baseTemplateSupport": "Toradex",
             "sampleSupport": "Community"
         }
+    },
+    "VPU": {
+        "generic": {
+            "folder": "vpuGeneric",
+            "baseTemplate": "genericTemplate",
+            "baseTemplateSupport": "Toradex",
+            "sampleSupport": "Community"
+        }
     }
 }

vpu/generic/vpuGeneric/README.md

@@ -0,0 +1,20 @@
+# VPU Generic Dockerfile Sample
+
+This sample demonstrates the use of VPU on i.MX8 devices for hardware
+accelerated encoding and decoding. It performs the encoding and decoding
+tests listed in the table below. The table also specifies what codec is
+supported by each target.
+
+
+|              | verdin-imx8mm | verdin-imx8mp | apalis-imx8 |
+|--------------|---------------|---------------|-------------|
+| H.264 Encode | ✅            | ✅            | ✅          |
+| H.264 Decode | ✅            | ✅            | ✅          |
+| H.265 Encode | ❌            | ✅            | ❌          |
+| H.265 Decode | ✅            | ✅            | ✅          |
+| VP8 Encode   | ✅            | ❌            | ❌          |
+| VP8 Decode   | ✅            | ✅            | ✅          |
+| VP9 Decode   | ✅            | ✅            | ❌          |
+
+Please select the correct SoM(MACHINE) in the Dockerfile and docker-compose.yml
+before running the test.