[Application] Add Simple Layers NNtrainer example(FC, LSTM, Conv)

[Application] Add Simple Layers NNtrainer example(FC, LSTM, Conv)

Add Simple Layers NNtrainer example(FC, LSTM, Conv)  with Dummy Data

Add Single Layer example
- Linear(Fully-Connected)
- Conv
- LSTM
- Model_A_Linear
- Model_A_Conv
- Model_C_Linear
- Model_C_Conv

We conduct Memory & Latency Benchmark test based on these code
It's Loss possibly show inf cause It's DataSet is Dummy If you want to get actual Loss set your own Dataset
- It support only training if user want they can set dataset, validation loss, test loss... etc

Signed-off-by: DongHak Park <donghak.park@samsung.com>