repo: add gitignore and nixd.json

.gitignore

@@ -0,0 +1,38 @@
+# Created by https://www.toptal.com/developers/gitignore/api/zig,vim
+# Edit at https://www.toptal.com/developers/gitignore?templates=zig,vim
+
+### Vim ###
+# Swap
+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+*~
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+### zig ###
+# Zig programming language
+
+zig-cache/
+zig-out/
+build/
+build-*/
+docgen_tmp/
+
+### meta ###
+run.sh
+result
+
+# End of https://www.toptal.com/developers/gitignore/api/zig,vim

.nixd.json

@@ -0,0 +1 @@
+{"formatting":{"command":"alejandra"}}