Added a readme

.gitignore

@@ -1,2 +1,3 @@
 build/
 compile_commands.json
+lander.data

README.md

@@ -0,0 +1,22 @@
+# Lander
+
+## The idea
+
+A URL shortener has always been on my list of things I'd like to write myself.
+It's simple, yet useful.
+
+for our Algorithms & Datastructures 3 class, we had to implement three
+different tries (Patricia trie, ternary trie, and a custom one). Considering
+these are efficient string-based search trees, this gave me the idea to use it
+as the backend for a URL shortener!
+
+This implementation currently uses a ternary trie as its search tree. The
+persistence model is very simple; I simply append a line to a text file every
+time a URL is added, and add the lines of this file to the trie on startup. The
+trie is stored completely im memory, and no I/O operations are required when
+requesting a redirect. This makes the server very fast.
+
+## The name
+
+I gave up giving my projects original names a long time ago, so now I just use
+the names of my friends ;p

landerctl

@@ -10,4 +10,7 @@ if [ "$1" = add ]; then
         -H "X-Api-Key: $API_KEY" \
         "$URL/$2"
     echo "$URL/$2"
+
+elif [ "$1" = get ]; then
+    curl -is "$URL/$2" | grep -Po '(?<=location: ).*'
 fi