Start implementing error explanations

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diff --git a/src/errors/NotARecord.txt b/src/errors/NotARecord.txt
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+Explanation: You can only access fields on records, like this:
+
+
+    ┌─────────────────────────────────┐
+    │ { foo = True, bar = "ABC" }.foo │  This is valid ...
+    └─────────────────────────────────┘
+
+
+    ┌───────────────────────────────────────────┐
+    │ λ(r : { foo : Bool, bar : Text }) → r.foo │  ... and so is this
+    └───────────────────────────────────────────┘
+
+
+... but you cannot access fields on non-record expressions
+
+For example, the following expression is $_NOT valid:
+
+
+    ┌───────┐
+    │ 1.foo │
+    └───────┘
+      ⇧
+      Invalid: Not a record
+
+
+You tried to access a field named:
+
+↳ $txt0
+
+... on the following expression which is not a record:
+
+↳ $txt1
+
+... but is actually an expression of type:
+
+↳ $txt2
+
+Some common reasons why you might get this error:
+
+● You accidentally try to access a field of a union instead of a record, like
+  this:
+
+
+    ┌─────────────────┐
+    │ < foo : a >.foo │
+    └─────────────────┘
+      ⇧
+      This is a union, not a record