Add docs

modules/lang/fsharp/README.org

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+#+TITLE:   lang/fsharp
+#+DATE:    May 22, 2019
+#+SINCE:   {replace with next tagged release version}
+#+STARTUP: inlineimages
+
+* Table of Contents :TOC_3:noexport:
+- [[#description][Description]]
+  - [[#module-flags][Module Flags]]
+  - [[#plugins][Plugins]]
+  - [[#hacks][Hacks]]
+- [[#prerequisites][Prerequisites]]
+  - [[#mono][Mono]]
+    - [[#osx][OSX]]
+    - [[#arch-linux][Arch Linux]]
+- [[#features][Features]]
+- [[#configuration][Configuration]]
+- [[#troubleshooting][Troubleshooting]]
+
+* Description
+# A summary of what this module does.
+
+# + If possible, include a brief list of feature highlights here
+# + Like code completion, syntax checking or available snippets
+# + Include links to packages & external things where possible
+This module adds [[https://fsharp.org/][F#]] support.
++ Code completion
++ eldoc support
++ Syntax checking
+
+** Module Flags
+This module provides no flags.
+
+** Plugins
++ [[https://github.com/fsharp/emacs-fsharp-mod+e][fsharp-mode]]
+** Hacks
+None so far.
+
+* Prerequisites
+** Mono
+To get code completion/syntax checking, you will need to install [[https://www.mono-project.com/][mono]].
+*** OSX
+Do *NOT* install mono via brew. See this [[https://github.com/fsharp/FsAutoComplete/issues/331][issue]].
+*** Arch Linux
+#+BEGIN_SRC sh
+sudo pacman -S mono
+#+END_SRC
+* Features
+An in-depth list of features, how to use them, and their dependencies.
+
+* Configuration
+How to configure this module, including common problems and how to address them.
+
+* Troubleshooting
+Common issues and their solution, or places to look for help.