Add missing files

os/process.c

@@ -0,0 +1,15 @@
+#include "process.h"
+#include "alloc.h"
+
+void create_process_table(ProcessTable **table) {
+    *table = malloc(sizeof(ProcessTable));
+    (*table)->entries = 0;
+}
+
+int create_process(ProcessTable *table, void *entrypoint) {
+    if (table->entries>=MAX_PROCESS) return 1;
+
+    Process *pentry = &table->process_list[table->entries++];
+    pentry->entrypoint = entrypoint;
+    return 0;
+}