Created AMD on Linux (markdown)

AMD-on-Linux.md

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+# Access permissions
+Easy Diffusion needs access to the GPU devices to use them for computations.
+1. Check the owner of one of these devices:
+    ```sh
+    ls -al /dev/kfd
+    ```
+2. Determine the name of the group:
+    ```
+    crw-rw---- 1 root render 511, 0 Sep  3 11:31 /dev/kfd
+                      ******
+    ```
+    In this example, the group owning the file is called `render`
+3. Check whether your user is member of this group:
+    ```sh
+    groups
+    ```
+    If your user is already a member of the group, you're done.
+4. If your user is not yet a member, add it to the group:
+    ```sh
+    sudo usermod -aG render $USER
+    ```
+    Replace `render` by the name of the group if it has a different name in your Linux distribution.
+5. Log off and log on again to make this change effective.
+