add EV3RT based on HRP3 kernel (svn r673, no_tecs)

Author: YixiaoLi

.gitignore

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+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.i*86
+*.x86_64
+*.hex
+
+# System image
+uImage
+
+# Build directories
+OBJ/
+
+# Debug files
+*.dSYM/
+
+# Exceptions
+!libusblib.a

.gitmodules

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+[submodule "modules/mbed-on-toppers"]
+	path = modules/mbed-on-toppers
+	url = https://github.com/ev3rt-git/mbed-on-toppers.git
+[submodule "modules/usblib"]
+	path = modules/usblib
+	url = https://github.com/ev3rt-git/usblib.git
+[submodule "modules/btstack"]
+	path = modules/btstack
+	url = https://github.com/ev3rt-git/btstack.git
+[submodule "sdk"]
+	path = sdk
+	url = https://github.com/ev3rt-git/ev3rt-hrp3-sdk.git