update readme

README.txt

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-This code is based on course project from Concordia University [COMP371](https://users.encs.concordia.ca/~graphics/teaching/computer-graphics/).
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-The following files are provided by the course instructor:
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-1. Showcased in `assets` folder (except for `cornell_box_demo`)
-2. Libraries and tests in `external` folder
-3. The `main.cpp` and `CMakeLists.txt`
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-Those files (except for CMakeLists.txt`) remain unchanged for evaluation purposes.
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-Please modify the cmake file for you to build on your machine.
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-The original readme content is attached below:
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-This code is used for three purposes:
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-1) Build the official course solution
-2) Build the student solution 
-3) Build a dummy application that showcases some of the codebase.
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-Each build is controlled by two defines:
-COURSE_SOLUTION and STUDENT_SOLUTION.
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-If none of these variables are defined the dummy code is built. This is the default behaviour.
-If COURSE_SOLUTION is defined, the code expects the course solution (this should never be defined)
-IF STUDENT_SOLUTION is defined the code expects a student solution is implemented in the src folder. Have a look at the main.cpp file for the expected interface.
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-You can switch on and off these defines in the CMakeLists.txt file. 
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-Building the dummy test
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-1) Create build folder: mkdir build
-2) cd build
-3) cmake ../
-4) make
-5) ./raytracer
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-Building the solution:
-1) Uncomment the #add_compile_options(-DSTUDENT_SOLUTION) line in the CMakeLists.txt 
-2) Create build folder: mkdir build
-3) Create the src folder: mkdir src
-3) cd build
-3) cmake ../
-4) make
-5) ./raytracer <filename.json>
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-Note that some test scenes are provided in the assets folder. You can do a soft link to the assets folder in the build folder for your convenience.