diff --git a/blah.cr b/blah.cr
new file mode 100644
index 0000000..07d5c0b
--- /dev/null
+++ b/blah.cr
@@ -0,0 +1,30 @@
+require "./src/dodb.cr"
+
+class Car
+	include JSON::Serializable
+
+	property name : String
+	property color : String
+	property keywords : Array(String)
+
+	def initialize(@name, @color, @keywords)
+	end
+end
+
+# Database creation
+db = DODB::DataBase(Car).new "db-cars"
+
+# Adding an element to the db
+db << Car.new "Corvet", "red", ["elegant", "fast"]
+
+# Reaching all objects in the db
+db.each do |car|
+	pp! car
+end
+
+# Reaching all objects in the db with their key.
+db.each_with_index do |car,key|
+	pp! car, key
+end
+
+db.delete 0
diff --git a/graphs/troffrc b/graphs/troffrc
new file mode 100644
index 0000000..8624241
--- /dev/null
+++ b/graphs/troffrc
@@ -0,0 +1,69 @@
+.\" Startup file for troff.
+.
+.\" This is tested by pic.
+.nr 0p 0
+.
+.\" Load composite mappings.
+.do mso composite.tmac
+.
+.\" Load generic fallback mappings.
+.do mso fallbacks.tmac
+.
+.\" Use .do here, so that it works with -C.
+.\" The groff command defines the .X string if the -X option was given.
+.ie r.X .do ds troffrc!ps Xps.tmac
+.el .do ds troffrc!ps ps.tmac
+.do ds troffrc!pdf pdf.tmac
+.do ds troffrc!dvi dvi.tmac
+.do ds troffrc!X75 X.tmac
+.do ds troffrc!X75-12 X.tmac
+.do ds troffrc!X100 X.tmac
+.do ds troffrc!X100-12 X.tmac
+.do ds troffrc!ascii tty.tmac
+.do ds troffrc!latin1 tty.tmac
+.do ds troffrc!utf8 tty.tmac
+.do ds troffrc!cp1047 tty.tmac
+.do ds troffrc!lj4 lj4.tmac
+.do ds troffrc!lbp lbp.tmac
+.do ds troffrc!html html.tmac
+.do if d troffrc!\*[.T] \
+.	do mso \*[troffrc!\*[.T]]
+.do rm troffrc!ps troffrc!Xps troffrc!dvi troffrc!X75 troffrc!X75-12 \
+troffrc!X100 troffrc!X100-12 troffrc!lj4 troff!lbp troffrc!html troffrc!pdf
+.
+.\" Test whether we work under EBCDIC and map the no-breakable space
+.\" character accordingly.
+.do ie '\[char97]'a' \
+.	do tr \[char160]\~
+.el \
+.	do tr \[char65]\~
+.
+.\" Set the hyphenation language to 'us'.
+.do hla us
+.
+.\" Disable hyphenation:
+.\" Do not load hyphenation patterns and exceptions.
+.\"do hpf hyphen.us
+.\"do hpfa hyphenex.us
+.
+.\" Disable adjustment by default,
+.\" such that manuals look similar with groff and mandoc(1).
+.\".ad l
+.\".de ad
+.\"..
+.\" Handle paper formats.
+.do mso papersize.tmac
+.
+.\" Handle PS images.
+.do mso pspic.tmac
+.do mso pdfpic.tmac
+.
+.\" ====================================================================
+.\" Editor settings
+.\" ====================================================================
+.
+.\" Local Variables:
+.\" mode: nroff
+.\" fill-column: 72
+.\" End:
+.\" vim: set filetype=groff textwidth=72: