More reliable scoping

docs/writing-a-program.md

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+## Writing programs with Ground
+
+Ground is a very easy language to learn. In this guide, you will learn how to write a simple calculator in Ground, as well as best practices (which there aren't many of, since Ground is so simple).
+
+Note: This assumes you've read and understand the syntax.md document in this folder.
+
+### Let's start!  
+
+Open a new file with the `.grnd` extension. Should look something like this:
+
+```
+
+```
+
+(Real empty in that file.)
+
+Let's add some code! Create a label for the start, since we'll loop back once we've calculated, and ask for the user's input:
+
+```
+@start
+stdout "Calculation: "
+stdin &calc
+```
+
+At the calc variable, we have whatever the user typed in. This should look something like `9+10`, `1 / 3` or who knows what else. But first we should organise this data. Let's create a loop to iterate through this input, and a counter to keep moving forward: