add powerline shell app

apps/Powerline-Shell/credits

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+Installation Script Created By RPICoder
+Added To Pi Apps By Botspot

apps/Powerline-Shell/description

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+A beautiful and useful prompt generator for Bash, ZSH, Fish, and tcsh:
+
+-Shows some important details about the git/svn/hg/fossil branch
+-Changes color if the last command exited with a failure code
+-If you're too deep into a directory tree, shortens the displayed path with an ellipsis
+-Shows the current Python virtualenv environment
+-It's easy to customize and extend.

apps/Powerline-Shell/install

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )")")"
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+# Get dependencies
+"${DIRECTORY}/pkg-install" "python3 python-pip fonts-powerline fonts-fantasque-sans" "$(dirname "$0")" || exit 1
+
+wget -qO- https://raw.githubusercontent.com/techcoder20/RPI-PowerlineShell-Installer/main/install.sh | bash || error "install.sh failed!"
+

apps/Powerline-Shell/uninstall

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )")")"
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+#if your app installs any packages, keep this command here so those packages will be removed.
+"${DIRECTORY}/purge-installed" "$(dirname "$0")" || exit 1
+
+wget -qO- https://raw.githubusercontent.com/techcoder20/RPI-PowerlineShell-Installer/main/uninstall.sh | bash || error "uninstall.sh failed!"

apps/Powerline-Shell/website

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+https://github.com/techcoder20/RPI-PowerlineShell-Installer.git