docs: add template oam app example

Signed-off-by: Peefy <xpf6677@163.com>

Author: Peefy

examples/kubevela/template-oam-app/kcl.mod

@@ -0,0 +1,7 @@
+[package]
+name = "inherit-oam-app"
+edition = "v0.10.0"
+version = "0.0.1"
+
+[dependencies]
+oam = "0.2.1"

examples/kubevela/template-oam-app/kcl.mod.lock

@@ -0,0 +1,10 @@
+[dependencies]
+  [dependencies.k8s]
+    name = "k8s"
+    full_name = "k8s_1.31.2"
+    version = "1.31.2"
+  [dependencies.oam]
+    name = "oam"
+    full_name = "oam_0.2.1"
+    version = "0.2.1"
+    sum = "bz5HT/ggMm6heYVUOaZd5mOLIv/q2jicXupv0ChDlsE="

examples/kubevela/template-oam-app/main.k

@@ -0,0 +1,27 @@
+import oam
+
+schema MyTemplate:
+    name: str
+    image: str
+    cmd?: [str]
+    port: int = 80
+
+schema MyApplication[template: MyTemplate](oam.Application):
+    metadata = {name = "kcl-play-svc"}
+    spec = oam.CoreOamDevV1beta1ApplicationSpec {
+        components = [{
+            name = metadata.name
+            type = "webservice"
+            properties = {
+                image = "kcllang/kcl"
+                ports = [{port = 80, expose = True}]
+                cmd = ["kcl", "play"]
+            }
+        }]
+    }
+
+MyApplication({
+    name = "kcl-play-svc"
+    image = "kcllang/kcl"
+    cmd: ["kcl", "play"]
+}) {}