Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/efun/sqrt b/doc/efun/sqrt
new file mode 100644
index 0000000..44c4805
--- /dev/null
+++ b/doc/efun/sqrt
@@ -0,0 +1,9 @@
+SYNOPSIS
+        float sqrt(int value);
+        float sqrt(floag value);
+
+BESCHREIBUNG
+        Liefert die Quadratwurzel von <value>.
+
+SIEHE AUCH
+        log(E), pow(E)
\ No newline at end of file