Add presentation and codegen script for first part of the session

Code-Generation-by-daniele-pecanha-n-zhenhao-ye/mustache_demo.ps1

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+#more details and credits to: https://github.com/swagger-api/swagger-codegen/tree/master
+
+# get swagger generator
+#wget https://repo1.maven.org/maven2/io/swagger/swagger-codegen-cli/2.4.31/swagger-codegen-cli-2.4.31.jar -O swagger-codegen-cli.jar
+
+# download swagger schema
+Invoke-WebRequest -Uri https://petstore.swagger.io/v2/swagger.yaml -o swagger.yaml
+
+# generate ps code
+java -jar swagger-codegen-cli.jar generate -i .\swagger.yaml -l powershell -o petstore/powershell
+
+# try to import
+import-Module .\petstore\powershell\src\IO.Swagger\\IO.Swagger.psm1
+
+#generate csharp code
+java -jar swagger-codegen-cli.jar generate -i .\swagger.yaml -l csharp -o petstore/powershell/csharp/SwaggerClient
+
+# build ps module
+./petstore/powershell/Build.ps1
+
+# Import module
+cd  .\petstore\powershell\src\IO.Swagger
+import-Module .\IO.Swagger.psd1 -Force
+
+# list cmdlets
+Get-Command -module IO.Swagger
+
+# get help
+Get-Help Invoke-StoreApiPlaceOrder -Full
+
+# place order
+$order = New-Order -id 1 -petId 125 -quantity 1 -shipDate (Get-Date) -status “approved” -complete $true
+Invoke-StoreApiPlaceOrder -body $order
+
+
+# Try again with mustache templates: 
+cd ../../../../
+
+# TODO: get mustache templates from 
+# https://github.com/swagger-api/swagger-codegen/tree/master/modules/swagger-codegen/src/main/resources/powershell
+
+# TODO: update api.mustache with your preferences
+
+# regenerate with templates
+java -jar swagger-codegen-cli.jar generate -i .\swagger.yaml -l powershell -o petstore/powershell -t .\mustache
+./petstore/powershell/Build.ps1
+
+# Import module
+cd  .\petstore\powershell\src\IO.Swagger
+import-Module .\IO.Swagger.psd1 -Force
+Get-Command -module IO.Swagger