Add maintenance document

Author: jimhester

.Rbuildignore

@@ -17,3 +17,4 @@
 ^pkgdown$
 ^man-roxygen$
 ^LICENSE\.md$
+^MAINTENANCE\.md$

MAINTENANCE.md

@@ -0,0 +1,13 @@
+## Current state
+
+Devtools is generally stable, most of the active development has moved to sub-packages like remotes and usethis, and relatively little code lives in devtools itself.
+
+## Known outstanding issues
+
+I don't know of any major outstanding issues in devtools itself.
+
+## Future directions
+
+The package development cheatsheet likely needs a major overhaul to account for much more functionality in usethis and the current state of devtools. https://github.com/r-lib/devtools/issues/2107
+
+Should devtools be converted to use pak for installation, or should the installation commands be deprecated in devtools and users suggested to use pak directly?