add pkgbuild and fix gitignore

.gitignore

@@ -1,3 +1,6 @@
 /target
 .idea
 Cargo.lock
+/pkg
+/src
+*tar*

PKGBUILD

@@ -0,0 +1,21 @@
+# Maintainer: Matt C <mdc028[at]bucknell[dot]edu>
+
+pkgname=malachite
+pkgver=1.0.0
+pkgrel=1
+pkgdesc="Crystal Linux Wallpaper Images"
+arch=('any')
+url="https://git.tar.black/crystal/programs/malachite"
+license=()
+source=()
+depends=()
+conflicts=()
+md5sums=()
+
+package() {
+
+    cd ../ && cargo build --release
+    mkdir -p "${pkgdir}/usr/bin"
+    cp target/release/mlc "${pkgdir}/usr/bin/."
+
+}