init(dbms): introduce Tanabata database management system (TDBMS)

Only basic database operations, only Unix domain sockets by now

include/tdbms-client.h

@@ -0,0 +1,27 @@
+// Tanabata DBMS client lib
+// By Masahiko AMANO aka H1K0
+
+#pragma once
+#ifndef TANABATA_DBMS_CLIENT_H
+#define TANABATA_DBMS_CLIENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "tdbms.h"
+
+// Connect to TDBMS server
+int tdbms_connect(const char *domain, const char *addr);
+
+// Close connection to TDBMS server
+int tdbms_close(int socket_fd);
+
+// Execute a TDB request
+int tdb_query(int socket_fd, const char *db_name, char request_code, const char *request_body, char **response);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //TANABATA_DBMS_CLIENT_H