Update README to clarify installation steps and add .opam file for dependencies

Author: congwang-mk

README.md

@@ -332,27 +332,33 @@ sudo ./my_project          # Run the program
 
 ## Getting Started
 
-1. **Install KernelScript:**
+1. **Install system dependencies (Debian/Ubuntu):**
+   ```bash
+   sudo apt update
+   sudo apt install libbpf-dev libelf-dev zlib1g-dev
+   ```
+
+2. **Install KernelScript:**
    ```bash
    git clone https://github.com/multikernel/kernelscript.git
    cd kernelscript
    opam install . --deps-only
    eval $(opam env) && dune build && dune install
    ```
 
-2. **Create your first project:**
+3. **Create your first project:**
    ```bash
    kernelscript -- init xdp hello_world
    cd hello_world/
    ```
 
-3. **Edit the generated code:**
+4. **Edit the generated code:**
    ```bash
    # Edit hello_world.ks with your logic
    vim hello_world.ks
    ```
 
-4. **Compile and run:**
+5. **Compile and run:**
    ```bash
    kernelscript compile hello_world/hello_world.ks
    cd hello_world/

kernelscript.opam

@@ -0,0 +1,28 @@
+opam-version: "2.0"
+name: "kernelscript"
+authors: ["Cong Wang"]
+maintainer: ["Cong Wang <cwang@multikernel.io>"]
+license: "Apache-2.0"
+homepage: "https://github.com/multikernel/kernelscript"
+bug-reports: "https://github.com/multikernel/kernelscript/issues"
+synopsis: "A modern programming language for eBPF development"
+depends: [
+  "ocaml"
+  "dune" {>= "2.9"}
+  "menhir"
+  "alcotest" {with-test}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]