cmake: Add missing example CMakeLists.txt files, CI check all examples have both

examples/protocols/http_server/simple/CMakeLists.txt

@@ -0,0 +1,10 @@
+# The following four lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+set(MAIN_SRCS main/main.c)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(simple)
+
+