add stack template

composer-lens/app.py

@@ -0,0 +1,14 @@
+from flask import Flask, render_template
+
+app = Flask(__name__)
+
+@app.route("/")
+def stack():
+    stack_name = "lab"
+    containers = ["website", "test-container", "composer"]
+    image = ["image1", "image2", "image3"]
+    status = [True, False, True]
+    return render_template("stack.html", stack="lab", containers=[(containers[i], status[i], image[i]) for i in range(len(containers))])
+
+if __name__=="__main__":
+    app.run()