Add Jenkins pipeline and update JSON comments

A new Jenkins pipeline has been added to the `Jenkinsfile` with a 'Build' stage executing `dotnet build`. The `appsettings.Development.json` file has been reformatted for consistency. In `appsettings.json`, comments have been added to explain the "Content-Security-Policy" nonce usage, logging levels, and the naming format for resource files in the `Cultures` section, aiding in localization management.

EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI/Jenkinsfile

@@ -0,0 +1,10 @@
+pipeline {
+    agent any
+    stages {
+        stage('Build') {
+            steps {
+                sh 'dotnet build'
+            }
+        }
+    }
+}

EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI/appsettings.json

@@ -55,7 +55,7 @@
     "ZoomStepPercentage": 5
   },
   "PSPDFKitLicenseKey": "SXCtGGY9XA-31OGUXQK-r7c6AkdLGPm2ljuyDr1qu0kkhLvydg-Do-fxpNUF4Rq3fS_xAnZRNFRHbXpE6sQ2BMcCSVTcXVJO6tPviexjpiT-HnrDEySlUERJnnvh-tmeOWprxS6BySPnSILkmaVQtUfOIUS-cUbvvEYHTvQBKbSF8di4XHQFyfv49ihr51axm3NVV3AXwh2EiKL5C5XdqBZ4sQ4O7vXBjM2zvxdPxlxdcNYmiU83uAzw7B83O_jubPzya4CdUHh_YH7Nlp2gP56MeG1Sw2JhMtfG3Rj14Sg4ctaeL9p6AEWca5dDjJ2li5tFIV2fQSsw6A_cowLu0gtMm5i8IfJXeIcQbMC2-0wGv1oe9hZYJvFMdzhTM_FiejM0agemxt3lJyzuyP8zbBSOgp7Si6A85krLWPZptyZBTG7pp7IHboUHfPMxCXqi-zMsqewOJtQBE2mjntU-lPryKnssOpMPfswwQX7QSkJYV5EMqNmEhQX6mEkp2wcqFzMC7bJQew1aO4pOpvChUaMvb1vgRek0HxLag0nwQYX2YrYGh7F_xXJs-8HNwJe8H0-eW4x4faayCgM5rB5772CCCsD9ThZcvXFrjNHHLGJ8WuBUFm6LArvSfFQdii_7j-_sqHMpeKZt26NFgivj1A==",
-  "Content-Security-Policy": [
+  "Content-Security-Policy": [ // The first format parameter {0} will be replaced by the nonce value.
     "default-src 'self'",
     "script-src 'self' 'nonce-{0}' 'unsafe-eval'",
     "style-src 'self' 'unsafe-inline' https://fonts.googleapis.com:*",
@@ -89,6 +89,7 @@
         "maxArchiveDays": 30
       }
     },
+    // Trace, Debug, Info, Warn, Error and *Fatal*
     "rules": [
       {
         "logger": "*",
@@ -115,6 +116,9 @@
     "Target": "_blank",
     "Title": "Digital Data GmbH"
   },
+  /* Resx naming format is -> Resource.language.resx (eg: Resource.de_DE.resx). 
+     To add a new language, first you should write the required resx file.
+     first is the default culture name. */
   "Cultures": [
     {
       "Language": "de-DE",