Start implementing error explanations

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diff --git a/src/errors/DuplicateAlternative.txt b/src/errors/DuplicateAlternative.txt
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+Explanation: Unions may not have two alternatives that share the same name
+
+For example, the following expressions are $_NOT valid:
+
+
+    ┌─────────────────────────────┐
+    │ < foo = True | foo : Text > │  Invalid: ❰foo❱ appears twice
+    └─────────────────────────────┘
+
+
+    ┌───────────────────────────────────────┐
+    │ < foo = 1 | bar : Bool | bar : Text > │  Invalid: ❰bar❱ appears twice
+    └───────────────────────────────────────┘
+
+
+You have more than one alternative named:
+
+↳ $txt0