diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1269488
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+data
diff --git a/docs/.gitkeep b/docs/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/shell.nix b/shell.nix
index 81c823e..107409e 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,9 +1,12 @@
-{ pkgs ? import <nixpkgs> {} }:
+{ pkgs ? import <nixpkgs> { } }:
 
 with pkgs;
 
 mkShell {
   buildInputs = [
-
+    python39
+    python39Packages.numpy
+    python39Packages.pandas
+    python39Packages.XlsxWriter
   ];
 }