Added information to worldwar1.md

history/events/world-war-1.md

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 # First World War
 
-Gosh, this sure was important. Maybe someone should add a page here?
+### Causes
+
+- Assassination of Archduke Franz Ferdinand 
+- Naval arms race between Germany and the United Kingdom
+- French Revanchism over Alsace-Lorraine
+
+### Important details
+
+Central Powers (Germany, Austria-Hungary, Ottoman Empire, Bulgaria) v. Triple Entente (UK, France, Russia)
+
+Lasted from July 28th, 1914, ended November 11th, 1918
+
+War in the West quickly devolves into Trench Warfare
+
+Battle of the Marne, 1914, German Army stopped North-East of Paris
+
+Battle of Verdun, 1916
+
+U.S joins Entente in 1917
+
+Bolshevik Revolution, 1917. Soviet Russia signs peace treaty of Brest-Litovsk with Central Powers
+
+November 11th, 1918, Armstice at Compiegne, Germany agrees to end of War
+
+First war with gas warfare used
+
+Tanks invented to break stalemate
+
+### Aftermath
+
+Treaty of Versailles, borders of Europe redrawn
+
+Collapse of Monarchies, e.g. Russian Empire, German Empire, Ottoman Empire