Add configuration for devcontainers (#79)

Resolves #69

Author: OptimumCode

.devcontainer/devcontainer.json

@@ -0,0 +1,37 @@
+{
+  "name": "KMP json schema validator",
+  "image": "mcr.microsoft.com/devcontainers/java:1.0-11",
+  "features": {
+    "ghcr.io/devcontainers/features/java:1" : {
+      "version": "11",
+      "installGradle": true,
+      "gradleVersion": "8.1"
+    },
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "3.10",
+      "installTools": false
+    },
+    "ghcr.io/rocker-org/devcontainer-features/apt-packages" : {
+      "packages": "tig"
+    },
+    "ghcr.io/devcontainers/features/sshd:1": {
+      "version": "latest"
+    }
+  },
+  // Download all required dependencies
+  "postCreateCommand": {
+    "install-dependencies": "./gradlew dependencies > /dev/null",
+    "init-submodules": "git submodule init && git submodule update",
+    "git-completion": "echo \"source /usr/share/bash-completion/completions/git\" >> ~/.bashrc"
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "fwcd.kotlin",
+        "redhat.java",
+        "github.vscode-github-actions",
+        "vscjava.vscode-gradle"
+      ]
+    }
+  }
+}

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "schema-test-suite"]
 	path = test-suites/schema-test-suite
-	url = git@github.com:json-schema-org/JSON-Schema-Test-Suite.git
+	url = https://github.com/json-schema-org/JSON-Schema-Test-Suite.git

README.md

@@ -13,6 +13,9 @@ This multiplatform library is an implementation of JSON schema that can validate
 [JsonElement](https://github.com/Kotlin/kotlinx.serialization/blob/master/formats/json/commonMain/src/kotlinx/serialization/json/JsonElement.kt)
 from [kotlinx.serialization-json](https://github.com/Kotlin/kotlinx.serialization/tree/master/formats/json) library.
 
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/OptimumCode/json-schema-validator)
+[![Open in DevPod!](https://devpod.sh/assets/open-in-devpod.svg)](https://devpod.sh/open#https://github.com/OptimumCode/json-schema-validator)
+
 ## Usage
 
 ### Supported targets
@@ -133,7 +136,7 @@ val valid = schema.validate(elementToValidate, errors::add)
 - [Draft 7](https://json-schema.org/specification-links.html#draft-7)
   <details>
   <summary>Supported keywords</summary>
-  
+
   - Core
 
   | Keyword     | Status                                                                                              |
@@ -340,9 +343,20 @@ You can see the results in the latest workflow execution.
 
 ## Developer notes
 
+### Build process
+
 The update to Kotlin 1.9.22 came with an issue for JS incremental compilation.
 In case you see an error about main function that already bind please execute `clean` task.
 
+### Devcontainer
+
+Devcontainers is a cool feature. However, by default in Codespaces and DevPod you will use [VS Code](https://code.visualstudio.com/).
+This is a good IDE but not for Kotlin, unfortunately.
+The extension that is available for VS Code to support Kotlin works quite slow (when workspace is just started)
+and sometimes does not work correctly with multiplatform definitions.
+Because of that I higly recoment using JetBrains Gateway
+(but it looks like the GitHub Codespace provider is not currently compatible with latest Gateway version).
+
 ## Future plans
 
 - [x] Add `$schema` property validation (if not set the latest supported will be used)