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briefly introduce each porjects.

README.md

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+# Projects in C/C++
+This repository contains the five projects I did in the [C/C++ course](https://github.com/ShiqiYu/CPP/tree/main) taught by Shiqi Yu.
+## Project 1
+Writing a calculator
+## Project2
+Implement basic matrix multiplication with C and Java, compare their speed with matricies of different sizes, also compare the speed between different compile options.
+## Project 3
+Implement matrix multiplication with SIMD and OpenMP, this is my first time using simd. Attempts of changing the order of the matrix multiplication is also included.
+## Project 4
+Implement a matrix class to allow basic operations, cuda is also implemented.
+## Project 5
+Speed up the matrix multiplication with parallel GPU, a parallel GPU algorithm that can utlize 4 GPU is implemented with cuBlas and OpenMP.