add include/usearch.h

Signed-off-by: kpango <kpango@vdaas.org>

Makefile

@@ -679,7 +679,8 @@ $(LIB_PATH)/libfaiss.a:
 
 .PHONY: usearch/install
 ## install usearch
-usearch/install:
+usearch/install: $(USR_LOCAL)/include/usearch.h
+$(USR_LOCAL)/include/usearch.h:
 	git clone --depth 1 --recursive --branch v$(USEARCH_VERSION) https://github.com/unum-cloud/usearch $(TEMP_DIR)/usearch-$(USEARCH_VERSION)
 	cd $(TEMP_DIR)/usearch-$(USEARCH_VERSION) && \
 	cmake -DCMAKE_BUILD_TYPE=Release \
@@ -698,8 +699,10 @@ usearch/install:
 	cmake --build $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build -j$(CORES)
 	cmake --install $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build --prefix=$(USR_LOCAL)
 	cd $(ROOTDIR)
-	cp $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build/libusearch_static_c.a $(LIB_PATH)/libusearch.a
-	cp $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build/libusearch_c.so $(LIB_PATH)/libusearch.so
+	cp $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build/libusearch_static_c.a $(LIB_PATH)/libusearch_c.a
+	cp $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build/libusearch_static_c.a $(LIB_PATH)/libusearch_static_c.a
+	cp $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/build/libusearch_c.so $(LIB_PATH)/libusearch_c.so
+	cp $(TEMP_DIR)/usearch-$(USEARCH_VERSION)/c/usearch.h $(USR_LOCAL)/include/usearch.h
 	rm -rf $(TEMP_DIR)/usearch-$(USEARCH_VERSION)
 	ldconfig