Add json schema (#133)

.editorconfig

@@ -7,3 +7,6 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.yml]
+indent_style = space

.eslintrc.json

@@ -1,4 +1,5 @@
 {
+	"$schema": "https://json.schemastore.org/eslintrc",
 	"parser": "@typescript-eslint/parser",
 	"plugins": ["@typescript-eslint"],
 	"extends": [

.github/workflows/validate-json.yml

@@ -0,0 +1,19 @@
+name: Validate JSON
+
+on:
+    push:
+        branches: [main]
+    pull_request:
+        branches: [main]
+
+jobs:
+    validate:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - name: Validate JSON files
+              uses: walbo/validate-json@v1.0.2
+              with:
+                  files: .eslintrc.json, tsconfig.json
+                  print-valid-files: true
+                  strict: false

tsconfig.json

@@ -1,4 +1,5 @@
 {
+	"$schema": "http://json.schemastore.org/tsconfig",
 	"compilerOptions": {
 		"baseUrl": ".",
 		"target": "es5",