feat: begin binary tree implementation

include/vieter_tree.h

@@ -0,0 +1,15 @@
+#ifndef VIETER_TREE
+#define VIETER_TREE
+
+#include <stdint.h>
+
+typedef struct vieter_tree vieter_tree;
+
+typedef enum vieter_tree_error {
+    vieter_tree_ok = 0,
+    vieter_tree_already_present = 1
+} vieter_tree_error;
+
+vieter_tree_error vieter_tree_insert(uint64_t key, void *data);
+
+#endif