Update README

README.md

@@ -1,4 +1,6 @@
 # Doom 2D Forever
+
+## Description
 **Doom 2D: Forever** is a modern version of a Russian freeware doom game Doom 2D.
 
 This open source multiplatform project, written from scratch, is designed to reproduce the original game with significant
@@ -9,11 +11,12 @@ improvements in gameplay, graphics and logic.
 
 ![MegaDM](docs/images/screenshots/screenshot-megadm.png)
 
-# Build
-Requirements:
-- FPC >= 3.0.4
-- libenet >= 1.3.13
+## Install
+
+### Flatpak
+Doom 2D: Forever has a Flatpak manifest, available at (https://github.com/Challenge9/org.doom2d.forever)
 
+## Build
 ```
   git clone --recurse-submodules https://github.com/Challenge9/doom2d-forever
   cd doom2d-forever
@@ -27,13 +30,12 @@ Requirements:
 Windows binaries will require the appropriate DLLs (SDL2.dll, SDL2_mixer.dll or
 FMODEx.dll, ENet.dll, miniupnpc.dll), unless you choose to static link them.
 
-**Important** Remember to clear the cache directory (`build/tmp` by default) after you've built the game!
+**NOTE** Remember to clear the cache directory (`build/tmp` by default) after you've built the game!
 
-# Run
+## Run
 - If you've followed build instructions above, `../../build/bin/Doom2DF`
 - If Doom2DF is installed in the system PATH, `Doom2DF`
 
-# Screenshots
-![MegaDM](docs/images/screenshots/screenshot-megadm.png)
+## Screenshots
 ![Castlevania.wad](docs/images/screenshots/screenshot-castlevania.png)
 ![Prikolsoft.wad](docs/images/screenshots/screenshot-prikolsoft.png)