add ctf event

Author: exoji2e

Makefile

@@ -2,4 +2,4 @@ build:
 	jekyll build
 
 dev:
-	jekyll serve
+	jekyll serve || echo "Try installing/reinstalling jekyll and webrick with gem install jekyll; gem install webrick"

README.md

@@ -18,7 +18,7 @@ If you want to help develop the site, download and install [Jekyll](jekyllrb.com
     1. For macOS: 
         1. Install homebrew
         1. `brew install ruby`
- 1. `gem install bundle` 
+ 1. `gem install jekyll webrick jekyll-redirect-from` 
  1. Clone this repository
  1. `cd` into the directory
  1. `bundle install`

_events/2021-05-21-intro-to-ctf.md

@@ -0,0 +1,12 @@
+---
+layout: event_small_title
+title: "Intro to CTF"
+place: "Discord"
+timerange: "17:30 - 19:00 UTC+2"
+---
+
+What is a CTF competition? Is it the way to become a hacker? 
+
+You will find the answers to these questions and more in this lecture by Code@LTH! We will give an intro to, among other things, web hacking and cryptography and finish up with a few demos. 
+
+The lecture will be held in Swedish at Code@LTH's discord server: [https://discord.gg/NpnXYj4](https://discord.gg/NpnXYj4).