Update usage instructions

Author: seancdavis

README.md

@@ -17,7 +17,9 @@ To see a full list of options use the `--help` flag:
 
 Options:
       --version  Show version number                                   [boolean]
-  -s, --starter  Choose a starter           [choices: "nextjs", "ts-nextjs"]
+  -s, --starter  Choose a starter               [choices: "nextjs", "ts-nextjs"]
+  -e, --example  Start from an example
+         [choices: "algolia-search", "dynamic-app", "sb-countdown", "sb-typist"]
       --help     Show help                                             [boolean]
 ```
 
@@ -31,6 +33,16 @@ npx create-stackbit-app --starter ts-nextjs
 
 If no starter option is provided, [the default starter](https://github.com/stackbit-themes/nextjs-starter) is used.
 
+### Starting from an Example
+
+Use the `--example` option to start a project from an example. Run the command with the `--help` flag to see a full list of available starters.
+
+```txt
+npx create-stackbit-app --example algolia-search
+```
+
+This will create a new project matching the name of the example, unless overridden (see below). [See here for a full list of starters](https://github.com/stackbit-themes/stackbit-examples).
+
 ### Setting Project Directory
 
 Pass a directory name as the only argument when running the command. For example, if you wanted your directory to be name `my-site`, the command would look something like this:
@@ -39,7 +51,7 @@ Pass a directory name as the only argument when running the command. For example
 npx create-stackbit-app my-site
 ```
 
-If no name is provided, the directory will be `my-stackbit-site-[id]`, where `[id]` is a randomly-generated string used to avoid directory conflicts.
+If no name is provided, the directory will be `my-stackbit-site` for starters or will match the name of the example if starting from an example. If the directory already exists, a timestamp value will be appended to the directory name to ensure uniqueness.
 
 ## Adding Stackbit to Existing Projects