Add an SQL package for tree-sitter
diff --git a/packages/tree-sitter-sql.nix b/packages/tree-sitter-sql.nix
new file mode 100644
index 0000000..6d7759c
--- /dev/null
+++ b/packages/tree-sitter-sql.nix
@@ -0,0 +1,17 @@
+{
+  tree-sitter,
+  callPackage,
+  fetchFromGitHub,
+  lib
+}: let
+  version = "218b672499729ef71e4d66a949e4a1614488aeaa";
+in callPackage "${tree-sitter}/grammar.nix" {} {
+  language = "sql";
+  version = builtins.substring 0 7 version;
+  source = fetchFromGitHub {
+    owner = "m-novikov";
+    repo = "tree-sitter-sql";
+    rev = version;
+    hash = lib.fakeSha256;
+  };
+}