onboarding for dune package management

Author: PizieDust

package.json

@@ -45,7 +45,40 @@
   "contributes": {
     "walkthroughs": [
       {
-        "id": "ocaml-onboarding",
+        "id": "dune-onboarding",
+        "title" : "OCaml: Setup Dune Package Management (manual)",
+        "description": "A guided, terminal based, installation of Dune Package Management",
+        "steps": [
+          {
+            "id": "install-dune-linux",
+            "when": "isLinux",
+            "title": "Install dune Package Management",
+            "description": "Dune Package Management is a new package manager for OCaml. Install it using the official script installer.\n\n[Open a terminal and run the dune install script](command:ocaml.install-dune)",
+            "media": {
+              "image": "assets/opam_install.jpg",
+              "altText": "While installing dune, you'll be asked a series of questions: (1) Where should dune be installed? You can press enter and use the default location, unless you wish to install it somehwere else. (2) if your shell config should be updated."
+            },
+            "completionEvents": [
+              "onCommand:ocaml.install-dune"
+            ]
+          },
+          {
+            "id": "install-dune-mac",
+            "when": "isMac",
+            "title": "Install dune for DPM",
+            "description": "Dune Package Management is a new package manager for OCaml. Install it using the official script installer.\n\n[Open a terminal and run the dune install script](command:ocaml.install-dune)",
+            "media": {
+              "image": "assets/opam_install.jpg",
+              "altText": "While installing dune, you'll be asked a series of questions: (1) Where should dune be installed? You can press enter and use the default location, unless you wish to install it somehwere else. (2) if your shell config should be updated."
+            },
+            "completionEvents": [
+              "onCommand:ocaml.install-dune"
+            ]
+          }
+        ]
+      },
+      {
+        "id": "opam-onboarding",
         "title": "OCaml: Setup opam dev environment (manual)",
         "description": "A guided, terminal based, installation of OCaml and essential tools with the opam package manager.",
         "steps": [