Merge branch 'chore/add_cmake_script_for_exapmle_openssl_demo' into 'master'

feat(examples): Add cmake script for openssl_demo

See merge request sdk/ESP8266_RTOS_SDK!138

Author: wujiangang

examples/protocols/openssl_demo/CMakeLists.txt

@@ -0,0 +1,8 @@
+# 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/user_main.c main/openssl_demo.c)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(openssl_demo)