feat: Adding Rust 1.68.2, README.md and setup script.

.gitignore

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+/linux/

README.md

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+Rust Development Environment
+==
+This repository contains a Rust development environment for offline installation.
+
+Rust Version: 1.68.2
+
+Installation:
+--
+1. Git clone into a directory:
+```
+~/ > git clone https://devt.de/krotik/env-rust.git
+```
+
+2. Run setup.sh:
+```
+~/env-rust/setup/ > setup.sh
+```
+
+3. Run install.sh:
+```
+~/env-rust/linux/rust-x.xx.x-x86_64-unknown-linux-gnu/ > sudo ./install.sh
+```
+The Rust commands e.g. `rustc` should now be available.
+
+
+Uninstallation:
+--
+1. Git clone into a directory:
+```
+~/env-rust/linux/rust-x.xx.x-x86_64-unknown-linux-gnu/ > sudo ./install.sh --uninstall
+```

setup/setup.sh

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+#!/bin/bash
+
+# setup.sh - Setup Go development software.
+
+PATH_CURRENT=`pwd`
+SETUP_ENV_SCRIPT_NAME=setup.sh
+
+# Find out the path of the setup script
+
+if [ $0 == $SETUP_ENV_SCRIPT_NAME ]; then
+    PATH_SETUP_SH="."
+else
+    PATH_SETUP_SH=${0/%\/$SETUP_ENV_SCRIPT_NAME}
+fi
+
+cd $PATH_SETUP_SH/..
+
+# Root dir of env-go
+
+ROOT_PATH=`pwd`
+
+# Define the paths
+
+TARGET_PATH=$ROOT_PATH/linux
+SOURCE_PATH=$ROOT_PATH/setup/pkg/linux
+
+# Extract files in place
+
+rm -fR $TARGET_PATH
+mkdir -p $TARGET_PATH
+
+cd $TARGET_PATH
+for filename in $SOURCE_PATH/*; do
+    echo ${filename}
+    echo ${filename: -7}
+    if [ ${filename: -7} == ".tar.gz" ]; then
+        tar -xvzf ${filename}
+    fi
+done