add mapping for telescope buffer fuzzy find

lua/plugins/mappings.lua

@@ -0,0 +1,13 @@
+return {
+  {
+    "AstroNvim/astrocore",
+    ---@type AstroCoreOpts
+    opts = {
+      mappings = {
+        n = {
+          ["<Leader>f/"] = require("telescope.builtin").current_buffer_fuzzy_find,
+        },
+      },
+    },
+  },
+}