add minimal documentation

README.md

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+# Instructions for Debian derivatives
+
+- Install required packages
+
+	$ sudo apt-get install build-essential
+
+- Fork this repository
+
+- (Preferably) Build examples and APUE library
+
+	$ make
+
+- Populate your own examples in `local*` subdirectories.  For example:
+
+	$ cd local
+        $ $EDITOR local.c
+
+  **Please note that the main source filename must be same as the subdirectory name (i.e. `local1/local1.c`)**
+
+- Build and run your example
+
+	$ cd .. # chdir to top dir
+	$ make
+        $ local/local