system/powershell: Added (command-line shell).

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

system/powershell/README

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+PowerShell is a task-based command-line shell and scripting language
+built on .NET. PowerShell helps system administrators and power-users
+rapidly automate tasks that manage operating systems (Linux, macOS, and Windows) and processes.
+
+After installing, you can start using PowerShell by typing "pwsh" in the Terminal.

system/powershell/doinst.sh

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+chmod +x /opt/microsoft/powershell/pwsh
+ln -s /opt/microsoft/powershell/pwsh /usr/bin/pwsh

system/powershell/powershell.SlackBuild

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+#!/bin/sh
+#
+# Slackware build script for powershell.
+#
+# Copyright 2019 Reza Talebi, Shahin Shahr, Iran.
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PRGNAM=powershell
+VERSION=${VERSION:-6.2.4}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+
+set -e
+
+if [ "$( uname -m )" = "x86_64" ]; then
+  ARCH="x86_64"
+  ARCHITECTURE="x64"
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+  BITS="amd64"
+else
+  echo "Package for $(uname -m) architecture is not available."
+  exit 1
+fi
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-${VERSION}-${BUILD}
+mkdir -p $PRGNAM-${VERSION}-${BUILD}
+cd $PKG
+mkdir -p opt/microsoft/powershell
+tar -zxf $CWD/$PRGNAM-${VERSION}-linux-${ARCHITECTURE}.tar.gz -C opt/microsoft/powershell
+chown -R root:root opt/microsoft/powershell
+
+mkdir -p usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+cat $CWD/doinst.sh > $PKG/install/doinst.sh
+
+cd $PKG
+/sbin/makepkg --linkadd y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}

system/powershell/powershell.info

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+PRGNAM="powershell"
+VERSION="6.2.4"
+HOMEPAGE="https://www.microsoft.com/powershell/"
+DOWNLOAD="UNSUPPORTED"
+MD5SUM=""
+DOWNLOAD_x86_64="https://github.com/PowerShell/PowerShell/releases/download/v6.2.4/powershell-6.2.4-linux-x64.tar.gz"
+MD5SUM_x86_64="fabec3658a95cd81ca715b7d1cb35cea"
+REQUIRES=""
+MAINTAINER="Reza Talebi"
+EMAIL="reza.talebi.73@outlook.com"

system/powershell/slack-desc

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+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+          |-----handy-ruler------------------------------------------------------|
+powershell: powershell (A task-based command-line shell and scripting language) 
+powershell:
+powershell: PowerShell is a task-based command-line shell and scripting language
+powershell: built on .NET. PowerShell helps system administrators and power-users 
+powershell: rapidly automate tasks that manage operating systems (Linux, macOS,
+powershell: and Windows) and processes.
+powershell: PowerShell base source code is now available in GitHub 
+powershell: and open to community contributions.
+powershell:
+powershell: https://www.microsoft.com/powershell/
+powershell: