[v3] Update Markdown files to latest spec (#129)

All Markdown files should, from this point on, start with a level one heading.
See exercism/configlet#150 for the rationale behind these changes.

The full specification can be found [here](https://github.com/exercism/docs/blob/main/contributing/standards/markdown.md).

config/exercise-readme-insert.md

@@ -0,0 +1,2 @@
+# exercise readme insert
+

docs/ABOUT.md

@@ -1,3 +1,5 @@
+# About
+
 [Reason](https://reasonml.github.io/) is a syntax and toolchain geared towards Javascript programmers, based on the functional language [OCaml](https://ocaml.org/)
 
 Being statically typed, it is likely to be safer than Javascript, but has powerful type inference which means type annotations do not get in your way.

docs/INSTALLATION.md

@@ -1,3 +1,5 @@
+# Installation
+
 You will need the Node Package Manager (npm) to install Reason. Follow the instructions [here](https://www.npmjs.com/get-npm)
 
 Once you have npm, install Reason by:

docs/LEARNING.md

@@ -1,3 +1,5 @@
+# Learning
+
 Exercism provides exercises and feedback but can be difficult to jump into for those learning Reason for the first time. These resources can help you get started:
 
 [Reason home page](https://reasonml.github.io/)

docs/RESOURCES.md

@@ -1,3 +1,5 @@
+# Resources
+
 * [Reason home page](https://reasonml.github.io/)
 * [Reason Standard Library API](https://reasonml.github.io/api/index.html)
 * [Programmer blog](https://lucasmreis.github.io/blog/learning-reasonml-part-1/)

docs/TESTS.md

@@ -1,3 +1,5 @@
+# Tests
+
 npm is used to run the tests. Follow the instructions [here](https://www.npmjs.com/get-npm) to install npm.
 
 Once you have fetched an exercise with ```exercism fetch reasonml```