changed variables to paramaters

.azure/pipelines/azure-pipelines-build.yml

@@ -1,16 +1,22 @@
-variables:
-  - name: ApplicationName
-    value: $(Build.DefinitionName)
-  - name: SolutionFile
-    value: 'src/Server-Managers.sln'
-  - name: ProjectFile
-    value: 'src/$(ApplicationName)/$(ApplicationName).csproj'
-  - name: BuildPlatform
-    value: AnyCPU
-  - name: BuildConfiguration
-    value: Release
-  - name: PublishFolder
-    value: publish
+parameters:
+- name: ApplicationName
+  type: string
+  default: $(Build.DefinitionName)
+- name: SolutionFile
+  type: string
+  default: 'src/Server-Managers.sln'
+- name: ProjectFile
+  type: string
+  default: 'src/$(ApplicationName)/$(ApplicationName).csproj'
+- name: BuildPlatform
+  type: string
+  default: AnyCPU
+- name: BuildConfiguration
+  type: string
+  default: Release
+- name: PublishFolder
+  type: string
+  default: publish
 
 stages:
 - stage: build