feat(devcontainer): Adds Dev Container configuration (#154)

This fixes #151, which makes it easier for users to easily use GitHub
Codespaces, providing them with a VS Code like environment with their
preferred settings/themes and the required dependencies, all within the
browser.

.devcontainer/devcontainer.json

@@ -0,0 +1,26 @@
+{
+    "name": "Go MCP SDK Dev Container",
+    "image": "mcr.microsoft.com/devcontainers/go",
+    "features": {
+        "ghcr.io/devcontainers/features/git-lfs:1": {}
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "golang.go",
+                "ms-vsliveshare.vsliveshare",
+                "VisualStudioExptTeam.vscodeintellicode",
+                "eamodio.gitlens",
+                "usernamehw.errorlens",
+                "aaron-bond.better-comments",
+                "GitHub.vscode-github-actions",
+                "vscode-icons-team.vscode-icons"
+            ],
+            "settings": {
+                "workbench.iconTheme": "vscode-icons"
+            }
+        }
+    },
+
+    "postCreateCommand": "go mod tidy"
+}

README.md

@@ -1,6 +1,8 @@
 <!-- Autogenerated by weave; DO NOT EDIT -->
 # MCP Go SDK v0.2.0
 
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/modelcontextprotocol/go-sdk)
+
 ***BREAKING CHANGES***
 
 This version contains breaking changes.

internal/readme/README.src.md

@@ -1,5 +1,7 @@
 # MCP Go SDK v0.2.0
 
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/modelcontextprotocol/go-sdk)
+
 ***BREAKING CHANGES***
 
 This version contains breaking changes.