Add Unloading A Buffer as a vim til.

vim/unloading-a-buffer.md

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+# Unloading A Buffer
+
+My preferred workflow with vim involves working across as many buffers as I
+need in a single window. I open files in new buffers as needed and navigate
+between existing ones with a number of built-in vim features and plugin
+shortcuts. Eventually though, my list of buffers gets a bit crowded making
+it difficult to move around and keep everything straight. One method for
+dealing with this is occasionally unloading the buffers you no longer need.
+This can be accomplished with `:bd`.
+
+To unload the current buffer:
+
+```
+:bd
+```
+
+To unload some other buffer by buffer number, say buffer 10:
+
+```
+:10bd
+```
+
+Caveat: unloading a buffer marks it as *unlisted* in the buffer list,
+meaning it won't appear in your normal view of the buffer list. It should
+also be noted that it does not remove it from the jump list or the global
+mark list.
+
+See `:h :bd` for more details.