build: add Makefile and C runtime configuration files

Makefile

@@ -0,0 +1,21 @@
+CC := gcc
+CFLAGS := -O3 -Wall -Wextra -std=c11 -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L
+LDFLAGS := -pthread -lcrypto -lm
+
+COMMON_OBJS := config.o utils.o json.o rpc.o types.o block_builder.o miner.o mining_loop.o
+
+.PHONY: all clean
+
+all: miner launcher
+
+miner: main.o $(COMMON_OBJS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+launcher: launcher.o $(COMMON_OBJS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	rm -f *.o miner launcher