fix READMEs named with lowercase

Author: James Hegedus

examples/with-electron/readme.md

@@ -10,6 +10,8 @@ Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bo
 
 ```bash
 npx create-next-app --example with-electron with-electron-app
+# or
+yarn create next-app --example with-electron with-electron-app
 ```
 
 ### Download manually

examples/with-markdown/readme.md

@@ -10,6 +10,8 @@ Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bo
 
 ```bash
 npx create-next-app --example with-markdown with-markdown
+# or
+yarn create next-app --example with-markdown with-markdown-app
 ```
 
 ### Download manually

examples/with-next-sass/readme.md

@@ -10,6 +10,8 @@ Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bo
 
 ```bash
 npx create-next-app --example with-next-sass with-next-sass-app
+# or
+yarn create next-app --example with-next-sass with-next-sass-app
 ```
 
 ### Download manually

examples/with-universal-configuration-runtime/readme.md

@@ -10,6 +10,8 @@ Download [`create-next-app`](https://github.com/segmentio/create-next-app) to bo
 
 ```bash
 npx create-next-app --example with-universal-configuration-runtime with-universal-configuration-runtime-app
+# or
+yarn create next-app --example with-universal-configuration-runtime with-universal-configuration-runtime-app
 ```
 
 ### Download manually