feat: adding devcontainer config (#79)

Adding Dev Container config and "Open in Codespaces" button at the top
of the README.

.devcontainer/devcontainer.json

@@ -0,0 +1,24 @@
+{
+  "name": "retina",
+  "image": "mcr.microsoft.com/devcontainers/base:jammy",
+  "features": {
+    "ghcr.io/devcontainers/features/common-utils:2": {},
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers/features/go:1": {},
+    "ghcr.io/devcontainers/features/kubectl-helm-minikube:1": {},
+    "ghcr.io/devcontainers-contrib/features/kind:1": {}
+  },
+  "postCreateCommand": "bash .devcontainer/installMoreTools.sh && kind create cluster",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "esbenp.prettier-vscode",
+        "golang.go",
+        "mutantdino.resourcemonitor",
+        "ms-vscode.makefile-tools",
+        "ms-kubernetes-tools.vscode-kubernetes-tools"
+      ]
+    }
+  }
+}

.devcontainer/installMoreTools.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# Install the required tools and dependencies
+sudo apt-get update && sudo apt-get install -y lsb-release wget software-properties-common gnupg clang-14 lldb-14 lld-14 clangd-14 man-db
+
+# Install LLVM 14
+export LLVM_VERSION=14
+curl -sL https://apt.llvm.org/llvm.sh | sudo bash -s "$LLVM_VERSION"

README.md

@@ -1,5 +1,7 @@
 # Retina
 
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=746962176)
+
 [![goreport][goreport-img]][goreport] ![GitHub release][release-img] [![retina-publish][godoc-badge]][godoc] ![license]
 
 [![retina-test][retina-test-image-badge]][retina-test-image] [![retinash][retinash-badge]][retinash] [![retina-publish][retina-publish-badge]][retina-publish] ![retina-codeql-img][retina-codeql-badge] ![retina-golangci-lint-img][retina-golangci-lint-badge]