Added some development quality of life improvements (#87)

+ added a json schema of ruleset files for better error detection /
intellisense.
+ added a ts-config file so that js files are validated for types
+ added an extensions.json config that recommends the official spectral
plugin as well as the red hat yaml plugin
+ added settings.json that configures automatic IDE linting of the
root.openapi.yml file as well as registering the json schema to ruleset
files

.vscode/extensions.json

@@ -0,0 +1,11 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+  // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+  // List of extensions which should be recommended for users of this workspace.
+  "recommendations": [
+    "stoplight.spectral",
+    "redhat.vscode-yaml"
+  ],
+  // List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+  "unwantedRecommendations": []
+}

.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+    "spectral.rulesetFile": "rulesets/src/.spectral.yml",
+    "spectral.validateFiles": [
+        "*.openapi.yml"
+    ],
+    "yaml.schemas": {
+      "spectralRulesetSchema.json": "*.ruleset.yml"
+    }
+}

rulesets/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+      "outDir": "./dist",
+      "module": "NodeNext",
+      "moduleResolution": "NodeNext",
+      "target": "ESNext",
+      "noImplicitAny": false,
+      "checkJs": true,
+      "allowJs": true,
+  },
+  "include": [
+      "test/**/*"
+  ],
+  "exclude": [
+      "./node_modules",
+      "./dist",
+  ]
+}