Update readme with build instructions and debugging notes

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Author: SlouchyButton

README

@@ -0,0 +1,49 @@
+# postgresql-setup
+
+## Requires
+
+### BuildRequires
+- m4
+- docbook-utils
+- help2man
+- elinks (pretty README.rpm-dist)
+- postgresql-server (detect current version)
+
+### Requires
+- coreutils
+
+### Suggested BuildRequires
+- util-linux (mountpoint utility)
+
+### Maintainer's BuildRequires
+- autoconf
+- automake
+- autoconf-archive
+
+## Maintainer notes
+Be careful about paths. Your might need to tweak paths either in configure
+  files, or in code based on your environment.
+- Line 49 of `/bin/postgresql-setup` in function `builddir_source ()` has to
+  be changed to location of your project otherwise you won't be able to run your
+  build without full installation into system paths
+    - For example line should be `. "/postgresql-setup/$file"` if your
+      working project is located at `/postgresql-setup`
+    - *Do NOT commit/merge this change*
+- Line 69 of `share/postgresql-setup/library.sh.in` in function
+  `parse_upgrade_setup()` has to be changed to reflect location of your project.
+    - For example line should be `local 
+      upgrade_confdir="/postgresql-setup/etc/@NAME_BINARYBASE@-setup/upgrade"` if your
+      working project is located at `/postgresql-setup`
+    - *Do NOT commit/merge this change*
+
+### Build instructions
+1. `autoreconf -vfi`
+2. `./configure --prefix=/usr`
+    - Prefix needed for fedora environment - one of the path tweaks that are needed
+3. `make`
+
+After aforementioned steps, you should be able to run freshly built
+postgresql-setup script directly from /bin folder in this repo.
+
+If no init system is present, PostgreSQL server can be run after initialization
+via `/usr/bin/pg_ctl -D /var/lib/pgsql/data -l /var/lib/pgsql/srv.log start`