add encrypting for save files

add libhydrogen for encrypting and decrypting

#9

libs/libhydrogen/Makefile.particle

@@ -0,0 +1,40 @@
+PARTICLE_PACKAGE ?= hydrogen-crypto.zip
+SRC = \
+	hydrogen.c \
+	hydrogen.h \
+	impl/common.h \
+	impl/core.h \
+	impl/gimli-core.h \
+	impl/hash.h \
+	impl/hydrogen_p.h \
+	impl/kdf.h \
+	impl/kx.h \
+	impl/pwhash.h \
+	impl/random.h \
+	impl/secretbox.h \
+	impl/sign.h \
+	impl/x25519.h \
+	impl/gimli-core/portable.h
+
+all: package
+
+package: $(PARTICLE_PACKAGE)
+
+$(PARTICLE_PACKAGE):
+	mkdir particle
+	mkdir particle/src
+	cp library.properties particle/.
+	cp README.md particle/.
+	cp LICENSE particle/.
+	cp -r impl particle/src/.
+	cp hydrogen.h particle/src/.
+	cp hydrogen.c particle/src/hydrogen.cpp
+	7z a -tzip -mx=9 -r $(PARTICLE_PACKAGE) particle/.
+	rm -rf particle
+
+.PHONY: clean
+
+clean:
+	rm -f tests/tests
+	rm -rf particle
+	rm -f $(PARTICLE_PACKAGE)