Feature/mbedtls (#84)

* try to import mbedtls and build it

* add stubs socket class

* some boilterplate, read and write function implemented

* more boilterplate / current error in handshake because no CA cert is setup

* add something so skip ca verification, can ws curl https://google.com !

* cleanup / close implemented

* tweak CMakefiles

* typo in include

* update readme

* disable unittests

third_party/mbedtls/crypto/programs/psa/CMakeLists.txt

@@ -0,0 +1,26 @@
+add_executable(crypto_examples crypto_examples.c)
+target_link_libraries(crypto_examples mbedcrypto)
+
+add_executable(key_ladder_demo key_ladder_demo.c)
+target_link_libraries(key_ladder_demo mbedcrypto)
+
+add_executable(psa_constant_names psa_constant_names.c)
+target_link_libraries(psa_constant_names mbedcrypto)
+
+add_custom_target(
+    psa_constant_names_generated
+    COMMAND ${PYTHON_EXECUTABLE} scripts/generate_psa_constants.py
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../../
+)
+add_dependencies(psa_constant_names psa_constant_names_generated)
+
+install(TARGETS
+            crypto_examples
+            key_ladder_demo
+            psa_constant_names
+        DESTINATION "bin"
+        PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
+
+install(PROGRAMS
+            key_ladder_demo.sh
+        DESTINATION "bin")