Update format, add PR template (#390)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,16 @@
+<!--
+Thank you for contributing!
+
+Here are a few things that will increase the chance that your pull request will get accepted:
+  - Follow the [format](https://github.com/poteto/hiring-without-whiteboards#format) prescribed in the readme
+  - Add one company at a time
+  - Do not attempt to sort other listings
+  - In your pull request message, add additional context on the interview process if necessary
+
+Pull requests that do not adhere to the format will be rejected.
+-->
+
+## Add <CompanyName>
+<!--
+Please give additional context about the interview process if necessary.
+-->

README.md

@@ -12,7 +12,19 @@ Please open a PR to be added.
 ### Format
 
 ```
-- [Company or team name within company](https://jobspage) | location | what you do instead
+- [Company or team name within company](https://jobspage) | locations | what you do instead
+```
+
+Locations should be separated by a `/`, `;` or `&`. Locations should be formatted like so:
+
+```
+San Francisco, CA; Tokyo, Japan; Moscow, Russia
+```
+
+Good example:
+
+```
+-[MyCompany](https://example.com/jobs) | San Francisco, CA; Tokyo, Japan; Moscow, Russia | Take home project that resembles a problem MyCompany solves for, then discussion about the code in-person
 ```
 
 ### Duds