feat: add .idea to .npmignore for webstorm developers (projen#236)

Closes projen#222 

*Description of changes:*

Saw a typo on the readme, decided to also fix an easy issue.

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.npmignore

@@ -7,6 +7,7 @@ dist
 /tsconfig.json
 /.github
 /.vscode
+/.idea
 /.projenrc.js
 /tsconfig.jest.json
 /coverage

README.md

@@ -148,7 +148,7 @@ Some examples for features built-in to project types:
 * Automated releases to npm, maven, NuGet and PyPI
 * Mergify configuration
 * LICENSE file generation
-* gitignore + npmigonre management
+* gitignore + npmignore management
 * Node "engines" support with coupling to CI build environment and @types/node
 * Anti-tamper: CI builds will fail if a synthesized file is modified manually
 

src/typescript.ts

@@ -219,6 +219,7 @@ export class TypeScriptProject extends NodeProject {
     this.npmignore?.exclude('/tsconfig.json');
     this.npmignore?.exclude('/.github');
     this.npmignore?.exclude('/.vscode');
+    this.npmignore?.exclude('/.idea');
     this.npmignore?.exclude('/.projenrc.js');
 
     // the tsconfig file to use for estlint (if jest is enabled, we use the jest one, otherwise we use the normal one).