issue dotnet#43: add info messages concerning install scripts purpose

Author: AR-May

Diff for: src/dotnet-install.ps1

@@ -145,6 +145,18 @@ function Say-Verbose($str) {
     }
 }
 
+function Say-Text-Separator() {
+    try
+    {
+        Write-Host ""
+    }
+    catch
+    {
+        # Some platforms cannot utilize Write-Host (Azure Functions, for instance). Fall back to Write-Output
+        Write-Output ""
+    }
+}
+
 function Say-Invocation($Invocation) {
     $command = $Invocation.MyCommand;
     $args = (($Invocation.BoundParameters.Keys | foreach { "-$_ `"$($Invocation.BoundParameters[$_])`"" }) -join " ")
@@ -635,6 +647,12 @@ function Prepend-Sdk-InstallRoot-To-Path([string]$InstallRoot, [string]$BinFolde
     }
 }
 
+Say "Please note that the intended use of this script is for Continuous Integration (CI) scenarios, where:"
+Say "- The SDK needs to be installed without user interaction and without admin rights."
+Say "- The SDK installation doesn't need to persist across multiple CI runs."
+Say "To set up a development environment or to run apps, use installers rather than this script. Visit https://dotnet.microsoft.com/download to get the installer."
+Say-Text-Separator
+
 $CLIArchitecture = Get-CLIArchitecture-From-Architecture $Architecture
 $SpecificVersion = Get-Specific-Version-From-Version -AzureFeed $AzureFeed -Channel $Channel -Version $Version -JSonFile $JSonFile
 $DownloadLink, $EffectiveVersion = Get-Download-Link -AzureFeed $AzureFeed -SpecificVersion $SpecificVersion -CLIArchitecture $CLIArchitecture

Diff for: src/dotnet-install.sh

@@ -59,6 +59,10 @@ say_verbose() {
     fi
 }
 
+say_text_separator() {
+    printf "\n" >&3
+}
+
 # This platform list is finite - if the SDK/Runtime has supported Linux distribution-specific assets,
 #   then and only then should the Linux distribution appear in this list.
 # Adding a Linux distribution to this list does not imply distribution-specific support.
@@ -1061,6 +1065,12 @@ if [ "$no_cdn" = true ]; then
     azure_feed="$uncached_feed"
 fi
 
+say "Please note that the intended use of this script is for Continuous Integration (CI) scenarios, where:"
+say "- The SDK needs to be installed without user interaction and without admin rights."
+say "- The SDK installation doesn't need to persist across multiple CI runs."
+say "To set up a development environment or to run apps, use installers rather than this script. Visit https://dotnet.microsoft.com/download to get the installer."
+say_text_separator
+
 check_min_reqs
 calculate_vars
 script_name=$(basename "$0")