chore: add a basic workflow for c bindings

bindings/c/.gitignore

@@ -1,2 +1 @@
-tests/hello
-tests/hello.o
+build/

bindings/c/Makefile

@@ -0,0 +1,37 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+RPATH=$(PWD)/../../target/debug
+CFLAGS = -I./include
+LDFLAGS = -L$(RPATH) -Wl,-rpath,$(RPATH)
+LIBS = -lopendal
+OBJ_DIR=build/
+
+all: $(OBJ_DIR) build test
+
+$(OBJ_DIR):
+	mkdir -p $@
+
+build:
+	cargo build
+
+test:
+	$(CC) tests/hello.c -o $(OBJ_DIR)/hello $(CFLAGS) $(LDFLAGS) $(LIBS)
+
+clean:
+	cargo clean
+	rm -rf $(OBJ_DIR)

bindings/c/README.md

@@ -0,0 +1,13 @@
+# OpenDAL C Binding (WIP)
+
+# Build C bindings
+
+```bash
+make
+make build
+make test
+```
+
+## License
+
+[Apache v2.0](https://www.apache.org/licenses/LICENSE-2.0)