README, .gitignore

Update building instructions and add tests/atconfig to .gitignore.
diff --git a/.gitignore b/.gitignore
index 8bc903b..9a8f70b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,11 @@
 Makefile.in
 Makefile
 Makefile.am.sample
+src/tests/atconfig
+src/tests/hnb-test
+src/tests/package.m4
+src/tests/test-helpers
+src/tests/test-hnbap
+src/tests/test-ranap
+src/tests/testsuite
+src/tests/testsuite.log
diff --git a/README b/README
index 53e949d..6557358 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-Osmocom Iuh expermientation code
+Osmocom Iuh experimentation code
 (C) 2015 by Harald Welte <laforge@gnumonks.org>
 
 This code is a playground for implementing something along the lines of
@@ -8,16 +8,29 @@
 
 h1. Building
 
-Just go to the 'src/' directory and type make.  As external library
-dependencies, you will need
+As external library dependencies, you will need
 * libosmocore from git://git.osmocom.org/libosmocore
 * libasn1c from git://git.osmocom.org/libasn1c
+* libsctp-dev (this is the package name in Debian)
+
+To bootstrap the build, in the root directory, run:
+
+    autoreconf --install
+
+After that, run the usual
+
+    ./configure [options]
+    make
+    [sudo] make install
 
 h1. Using
 
+Note: osmo-iuh is in active development (December 2015, January 2016) so below
+statements may outdate rapidly.
+
 there's not much to use yet.  But if you run the 'hnbgw' executable,
 it will open a listening SCTP socket and wait for incoming Iuh
-connections.  It will accept any HNB-REGITER-REQUEST, so the homeNodeB
+connections.  It will accept any HNB-REGISTER-REQUEST, so the homeNodeB
 should start to establish RUA and RANAP (which we haven't implemented
 yet).