NEW add devcontainer (#9)

.devcontainer/Dockerfile

@@ -0,0 +1,17 @@
+ARG GO_VERSION=1.21
+ARG ALPINE_VERSION=3.18
+
+FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION}
+
+# Install packages and Go language server
+RUN apk add -q --update --progress --no-cache git sudo openssh-client bash make
+RUN go install golang.org/x/tools/gopls@latest 2>&1 && \
+    go install github.com/cweill/gotests/gotests@latest 2>&1 && \
+    go install github.com/fatih/gomodifytags@latest 2>&1 && \
+    go install github.com/josharian/impl@latest 2>&1 && \
+    go install github.com/haya14busa/goplay/cmd/goplay@latest 2>&1 && \
+    go install github.com/go-delve/delve/cmd/dlv@latest 2>&1 && \
+    go install honnef.co/go/tools/cmd/staticcheck@latest 2>&1
+
+# Install additional tools
+RUN go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest 2>&1

.devcontainer/devcontainer.json

@@ -0,0 +1,15 @@
+{
+	"dockerFile": "Dockerfile",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"golang.go",
+				"ms-azuretools.vscode-docker",
+				"ms-vscode.makefile-tools"
+			],
+			"settings": {
+				"go.useLanguageServer": true
+			}
+		}
+	}
+}