Working on repl, not fully working yet, read more

After a few hours struggling with the linker, I've got the main.c file
running correctly, with caveats:

- must be executed from out/
- only building on linux for the moment
- no tests written yet

I will write some CI jobs to see if the repl works eventually.

repl/main.c

@@ -0,0 +1,52 @@
+#include "toy_memory.h"
+
+#include <stdio.h>
+
+unsigned char* readFile(const char* path, int* size) {
+	//open the file
+	FILE* file = fopen(path, "rb");
+	if (file == NULL) {
+		return NULL;
+	}
+
+	//determine the file's length
+	fseek(file, 0L, SEEK_END);
+	*size = ftell(file);
+	rewind(file);
+
+	//make some space
+	unsigned char* buffer = TOY_ALLOCATE(unsigned char, *size);
+	if (buffer == NULL) {
+		fclose(file);
+		return NULL;
+	}
+
+	//
+	if (fread(buffer, sizeof(unsigned char), *size, file) < *size) {
+		fclose(file);
+		*size = -1; //singal a read error
+		return NULL;
+	}
+
+	fclose(file);
+	return buffer;
+}
+
+
+int main(int argc, char* argv[]) {
+	int size = 0;
+	unsigned char* buffer = readFile("../repl/main.c", &size); //for now, just grab the main.c file as a test
+
+	if (buffer == NULL) {
+		fprintf(stderr, "Failed to open the file\n");
+	}
+
+	if (size < 0) {
+		fprintf(stderr, "Failed to read the file\n");
+	}
+
+	TOY_FREE_ARRAY(unsigned char, buffer, size);
+
+	printf("All good\n");
+	return 0;
+}