adds pinguinfuss contributed fix (#73)

#### 📖 Summary

- redo PR from @pinguinfuss
  - fix error message
  - fix string quotation

#### 📑 Test Plan

> 💡 Select your test plan for the code changes.

- [x] Tested via Drone.io pipeline
- [ ] Custom test
- [ ] No test plan

##### Details / Justification

<!-- Add your test details or justification for missing tests here. -->

#### 📚 Additional Notes

- just redo #72.
  - there was an issue caused by git config `core.autocrl` displaying / diffin the wrong line ending sequence

Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #73

src/Item/New-CredentialStoreItem.Tests.ps1

@@ -102,7 +102,7 @@ Describe "New-CredentialStoreItem" {
         It "Missing CredentialStore should throw" {
             {
                 New-CredentialStoreItem -Shared -Path '/tmp/missingStore.json' -RemoteHost 'notrelevant'
-            } | Should -Throw "Could not add anything into the given CredentialStore."
+            } | Should -Throw "The given credential store (/tmp/missingStore.json) does not exist!"
         }
     }
     Context "Testing pipeline paramter" {

src/Item/New-CredentialStoreItem.ps1

@@ -32,7 +32,7 @@ function New-CredentialStoreItem {
         [None]
 
     .EXAMPLE
-        New-CredentialStoreItem -Path "C:\TMP\mystore.json" -RemoteHost "esx01.myside.local"
+        New-CredentialStoreItem -Path 'C:\TMP\mystore.json' -RemoteHost esx01.myside.local'
     #>
 
     [CmdletBinding(DefaultParameterSetName = 'Private')]
@@ -68,7 +68,7 @@ function New-CredentialStoreItem {
 
     begin {
         # Set the CredentialStore for private, shared or custom mode.
-        Write-Debug ("ParameterSetName: {0}" -f $PSCmdlet.ParameterSetName)
+        Write-Debug ('ParameterSetName: {0}' -f $PSCmdlet.ParameterSetName)
         if ($PSCmdlet.ParameterSetName -eq 'Private') {
             $Path = Get-DefaultCredentialStorePath
         }
@@ -84,9 +84,9 @@ function New-CredentialStoreItem {
         if (-not(Test-CredentialStore -Shared -Path $Path)) {
             $MessageParams = @{
                 Exception   = [System.IO.FileNotFoundException]::new(
-                    'Could not add anything into the given CredentialStore.'
+                    'The given credential store ({0}) does not exist!' -f $Path
                 )
-                ErrorAction = "Stop"
+                ErrorAction = 'Stop'
             }
             Write-Error @MessageParams
         }
@@ -95,8 +95,8 @@ function New-CredentialStoreItem {
 
         $CurrentDate = Get-Date -Format 'u'
 
-        if ($Identifier -ne "") {
+        if ($Identifier -ne '') {
-            $CredentialName = $RemoteHost = "{0}/{1}" -f $Identifier, $RemoteHost
+            $CredentialName = $RemoteHost = '{0}/{1}' -f $Identifier, $RemoteHost
         }
         else {
             $CredentialName = $RemoteHost