Add `make install` and `make uninstall`

Makefile

@@ -1,4 +1,5 @@
 MultiThread = Yes
+InstallPrefix = /usr/local/bin
 
 PROGNAME = torrent-verify
 CC = cc
@@ -17,6 +18,12 @@ OBJS = $(SOURCE:.c=.o)
 
 all: $(PROGNAME)
 
+install: $(PROGNAME)
+	install -s -- $< $(InstallPrefix)/$(PROGNAME)
+
+uninstall:
+	rm -r -- $(InstallPrefix)/$(PROGNAME)
+
 $(PROGNAME): $(OBJS)
 	$(CC) -o $@ $+ $(CFLAGS) $(CPPFLAGS)