Add .gitignore, remove unnecessary externs

.gitignore

@@ -0,0 +1,5 @@
+*.elf
+*.nacp
+*.nro
+build
+.vscode

include/unzip.hpp

@@ -1,6 +1,4 @@
-extern "C" {
 #include <minizip/unzip.h>
-}
 
 namespace zipStuff {
     bool extractFile(const std::string filename, const std::string destination);

source/unzip.cpp

@@ -1,6 +1,4 @@
-extern "C" {
 #include <minizip/unzip.h>
-}
 #include <algorithm>
 #include <dirent.h>
 #include <string>