Added devcontainer for spec writers

.devcontainer/Dockerfile

@@ -0,0 +1,21 @@
+FROM mcr.microsoft.com/mirror/docker/library/ubuntu:22.04
+
+RUN apt-get -y update &&  apt upgrade -y && apt install curl -y
+RUN apt-get -y install git
+
+# install node and npm
+RUN curl -sL https://deb.nodesource.com/setup_16.x | bash -
+RUN apt -y install nodejs
+RUN npm install -g npm@9.5.0
+
+# install oav tool
+RUN npm install -g oav@latest
+
+# install powershell
+RUN apt-get update && apt-get install -y wget
+RUN wget -q https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+RUN dpkg -i packages-microsoft-prod.deb
+RUN apt-get update
+RUN apt-get install -y powershell
+
+ENTRYPOINT ["/bin/bash"]

.devcontainer/devcontainer.json

@@ -0,0 +1,12 @@
+{
+  "name": "TypeSpec Dev Container",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "remoteUser": "root"
+  /*,
+  update below source folder to your local sdk-repos folder
+  "mounts": [
+    "source=/home/rc/repos/tmp/sdk-repos,target=/workspaces/sdk-repos,type=bind,consistency=cached"
+  ]*/
+}

eng/scripts/TypeSpec-Generate-Sdk.ps1

@@ -1,3 +1,17 @@
+###
+# Conventient usage: 
+# 1) generate specific language sdk based on current typespec folder
+#   ./TypeSpec-Generate-Sdk.ps1 -SdkLanguage {language}
+#   e.g. ./TypeSpec-Generate-Sdk.ps1 -SdkLanguage dotnet
+# The pre-requisite is the sdk repos path in local machine follows below convention:
+# 1). "azure-rest-api-specs" and "sdk-repos" are peer folder under same parent folder
+# 2). each sdk language repo is under "sdk-repos" folder, i.e.
+#     sdk-repos/azure-sdk-for-net
+#     sdk-repos/azure-sdk-for-java
+#     sdk-repos/azure-sdk-for-python
+#     sdk-repos/azure-sdk-for-js
+###
+
 [CmdletBinding()]
 param (
   [Parameter(Position = 0)]
@@ -8,11 +22,67 @@ param (
   [Parameter(Position = 2)]
   [string] $CommitHash,
   [Parameter(Position = 3)]
-  [string] $RepoUrl
+  [string] $RepoUrl,
+  [string] $SdkLanguage
 )
 
-if ($TypeSpecProjectDirectory -contains ".") {
-  $TypeSpecProjectDirectory = Resolve-Path $TypeSpecProjectDirectory
+$TypeSpecProjectDirectory = (Resolve-Path $TypeSpecProjectDirectory).Path
+
+if ($SdkLanguage) {
+  # example value of TypeSpecProjectDirectory: /workspaces/azure-rest-api-specs/specification/contosowidgetmanager/Contoso.WidgetManager
+  $index = $TypeSpecProjectDirectory.IndexOf("specification")
+  if ($index -eq -1) {
+    Write-Error "The input TypeSpecProjectDirectory parameter doesn't have 'specification' folder in its path: $TypeSpecProjectDirectory"
+    exit 1
+  }
+  $specFolderPath = $TypeSpecProjectDirectory.Substring(0, $index - 1)
+  $rootPath = Split-Path $specFolderPath -Parent
+  $sdkRepoRoot = Join-Path $rootPath "sdk-repos"
+  if (!(Test-Path $sdkRepoRoot)) {
+    Write-Error "sdk repos root folder doesn't eixst: $sdkRepoRoot"
+    exit 1
+  }
+
+  # trying to locate the default sdk repo folder under 'sdk-repos' folder by language value
+  switch ($SdkLanguage) {
+    "dotnet" {
+      Write-Host "Generating dotnet sdk code ..."
+      $sdkRepoPath = Join-Path $sdkRepoRoot "azure-sdk-for-net"
+      if (!(Test-Path $sdkRepoPath)) {
+        Write-Error "sdk repo doesn't exist: $sdkRepoPath"
+        exit 1
+      }
+    }
+    "java" {
+      Write-Host "Generating java sdk code ..."
+      $sdkRepoPath = Join-Path $sdkRepoRoot "azure-sdk-for-java"
+      if (!(Test-Path $sdkRepoPath)) {
+        Write-Error "sdk repo doesn't exist: $sdkRepoPath"
+        exit 1
+      }
+    }
+    "python" {
+      Write-Host "Generating python sdk code ..."
+      $sdkRepoPath = Join-Path $sdkRepoRoot "azure-sdk-for-python"
+      if (!(Test-Path $sdkRepoPath)) {
+        Write-Error "sdk repo doesn't exist: $sdkRepoPath"
+        exit 1
+      }
+    }
+    "js" {
+      Write-Host "Generating js sdk code ..."
+      $sdkRepoPath = Join-Path $sdkRepoRoot "azure-sdk-for-js"
+      if (!(Test-Path $sdkRepoPath)) {
+        Write-Error "sdk repo doesn't exist: $sdkRepoPath"
+        exit 1
+      }
+    }
+    default {
+      Write-Error "The input SdkLanguage parameter should be one of this values: dotnet, java, python, js"
+      exit 1
+    }
+  }
+  $SdkRepoRootDirectory = $sdkRepoPath
 }
 
 try {