feat: open and load file into memory

docs/todos.md

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+# Todos
+
+- [x] How to capture arguments passed to a C program
+    
+      ```c
+      // argc is the number of args passed
+      // argc is always 1 or more
+      // argc always has name/path of program as first arg
+      int main(int argc, char *argv[]) {
+      // do stuff with the args
+      }
+      ```
+- [x] How to print argument value
+      
+      ```
+      printf("%s", argv[1]);
+      ```
+
+- [x] Read a file
+    
+      ```c
+      // open file in read mode. returns NULL if doesn't exist
+      FILE *file_ptr = fread(file_path, "r");
+      
+      // seeking to end of file.
+      // useful telling number of bytes
+      fseek(file_ptr, 0, SEEK_END);
+
+      // get number of bytes
+      int num_of_bytes = ftell(file_ptr);
+      
+      // seek to begin of file
+      fseek(file_ptr, 0, SEEK_SET);
+      ```
+
+- [x] Store contents of file in memory
+- [x] Print file contents
+- [x] Print instructions
+- [x] Make sure program occupies correct space in chip memory
+- [ ] Parse individual instructions from binary CHIP-8 file