Add instructions.

README.md

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+# Computing tips
+
+This repository contains computing tips for scientists from scientists. Follow the instructions below to add your own!
+
+## Instructions
+
+Fill in the blanks (`___`) with your information.
+
+1. Fork the repository to your account
+
+1. Clone your fork of the repository (fill in your username)
+
+    ```
+    git clone https://github.com/___/computing-tips
+    ```
+
+1. Navigate to the Git repository
+
+    ```
+    cd computing-tips
+    ```
+
+1. Write your tip in a file. Give it an informative name.
+
+    ```
+    nano ___
+    ```
+
+1. Add the file
+
+    ```
+    git add ___
+    ```
+
+1. Commit the file. Write a descriptive message.
+
+    ```
+    git commit
+    ```
+
+1. Push to your fork on GitHub
+
+    ```
+    git push origin master
+    ```
+
+1. Open a Pull Request