added compile script

scripts/build.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env sh
+
+version=$(grep -i version norg.nimble | awk '{print $3}' | sed "s/\"//g" | sed "s/\./_/g")
+dir=$(pwd)
+echo Building for Linux
+nimble build -d:linux
+if [ $? != 1 ]; then
+    echo "Compressing..."
+    cd bin || exit
+    tar cvzf "norg_linux_$version.tar.gz" norg
+    rm norg
+    cd "$dir" || exit
+    echo Done.
+fi
+
+echo Building for FreeBSD
+nimble build -d:freebsd
+if [ $? != 1 ]; then
+    echo "Compressing..."
+    cd bin || exit
+    tar cvzf "norg_freebsd_$version.tar.gz" norg
+    rm norg
+    cd "$dir" || exit
+    echo Done.
+fi
+
+echo Building for Windows
+nimble build -d:mingw
+if [ $? != 1 ]; then
+    echo "Zipping..."
+    cd bin || exit
+    cp ../resources/windows/lib* ./
+    zip "norg_windows_$version.zip" norg.exe lib*
+    rm ./lib*
+    cd "$dir" || exit
+    rm bin/norg.exe
+    echo Done.
+fi