Update README - add libstdc++-12-dev as the prerequisites for building rocDecode (#102)

README.md

@@ -24,11 +24,17 @@ rocDecode is a high performance video decode SDK for AMD GPUs. rocDecode API let
   ```
 
 * libdrm-dev `2.4` or later
-  
+
   ```shell
   sudo apt install libdrm-dev
   ```
 
+* libstdc++-12-dev
+
+  ```shell
+  sudo apt install libstdc++-12-dev
+  ```
+
 * **Note** [rocDecode-setup.py](rocDecode-setup.py) script can be used for installing all the dependencies
 
 ## Build instructions