Add dev section to README.md and update makefile to reflect new section.

Makefile

@@ -11,7 +11,7 @@ uninstall:
 
 docs:
 	pandoc -s -w man docs/manpage_header.md docs/header.md docs/body.md -o docs/autojump.1
-	pandoc -s -w markdown docs/header.md docs/install.md docs/body.md -o README.md
+	pandoc -s -w markdown docs/header.md docs/install.md docs/development.md docs/body.md -o README.md
 
 release:
 	# Check for tag existence

README.md

@@ -107,6 +107,21 @@ and follow on screen instructions.
 If you keep getting `autojump: command not found` at the prompt,
 do:`unset PROMPT_COMMAND`. You can also restart your shell.
 
+DEVELOPMENT
+-----------
+
+The source code is primarily in `./bin/autojump`. Various shell wrapper
+scripts are also available in `./bin/`.
+
+Documentation is in various files under `./docs/`. Build documentation
+with the command:
+
+    make docs
+
+Unit tests are available in `./tests/`. Run unit tests with the command:
+
+    make test
+
 OPTIONS
 -------
 

docs/development.md

@@ -0,0 +1,11 @@
+## DEVELOPMENT
+
+The source code is primarily in `./bin/autojump`. Various shell wrapper scripts are also available in `./bin/`.
+
+Documentation is in various files under `./docs/`. Build documentation with the command:
+
+    make docs
+
+Unit tests are available in `./tests/`. Run unit tests with the command:
+
+    make test