zxcvbn-c: new module for password strength estimation

src/zxcvbn-c/.gitignore

@@ -0,0 +1,28 @@
+*.o
+*.ko
+*.obj
+*.elf
+*.gch
+*.pch
+*.lib
+*.a
+*.la
+*.lo
+*.dll
+*.so
+*.so.*
+*.dylib
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+test.cpp
+zxcvbn.cpp
+zxcvbn.dict
+test-*file
+test-*line
+test-*lib
+dictgen
+dict-*.h