PNPM documentation changes

cli/README.md

@@ -6,8 +6,10 @@ Please see the [Immich CLI documentation](https://immich.app/docs/features/comma
 
 Before building the CLI, you must build the immich server and the open-api client. To build the server run the following in the server folder:
 
-    $ npm install
-    $ npm run build
+    # if you don't have pnpm installed
+    $ npm install -g pnpm 
+    $ pnpm install
+    $ pnpm build
 
 Then, to build the open-api client run the following in the open-api folder:
 
@@ -15,8 +17,10 @@ Then, to build the open-api client run the following in the open-api folder:
 
 To run the Immich CLI from source, run the following in the cli folder:
 
-    $ npm install
-    $ npm run build
+    # if you don't have pnpm installed
+    $ npm install -g pnpm 
+    $ pnpm install
+    $ pnpm build
     $ ts-node .
 
 You'll need ts-node, the easiest way to install it is to use npm: