chore: include README in npm package (#1019)

Author: makhnatkin

.gitignore

@@ -18,6 +18,9 @@ temp/
 # git merge leftovers
 *.orig
 
+# generated during pack
+packages/editor/README.md
+
 # build
 .cache
 .cache*

packages/editor/package.json

@@ -27,6 +27,8 @@
     "test:watch": "jest --watchAll",
     "test:esbuild": "node tests/esbuild-test/esbuild-tester.js",
     "test:circular-deps": "node scripts/check-circular-deps.js 48",
+    "prepack": "cp ../../README.md ./README.md",
+    "postpack": "rm -f ./README.md",
     "prepublishOnly": "pnpm run lint && pnpm run clean && pnpm run build"
   },
   "exports": {
@@ -156,7 +158,8 @@
   "module": "build/esm/index.js",
   "types": "build/esm/index.d.ts",
   "files": [
-    "build"
+    "build",
+    "README.md"
   ],
   "dependencies": {
     "@bem-react/classname": "^1.6.0",