Added README file

Change-Id: Id8146293d61a37b34bd3aac656cba0aa94ff7331
Reviewed-on: https://weave-review.googlesource.com/1070
Reviewed-by: Alex Vakulenko <avakulenko@google.com>

libweave/README

diff --git a/libweave/README b/libweave/README
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+Overview
+--------
+libWeave is the library to with device side implementation of Weave
+protocol.
+
+Sources
+-------
+Sources are located in git repository at
+https://weave.googlesource.com/weave/libweave/
+
+Checkout code with:
+
+  git clone https://weave.googlesource.com/weave/libweave && \
+    (cd libweave && \
+     curl -Lo `git rev-parse --git-dir`/hooks/commit-msg \
+        https://gerrit-review.googlesource.com/tools/hooks/commit-msg ;\
+        chmod +x `git rev-parse --git-dir`/hooks/commit-msg)
+
+Directory structure
+-------------------
+Includes to be used by device code:
+  include/
+
+Implementation sources:
+  src/
+
+Example of device code:
+  examples/
+
+Optional dependencies:
+  external/
+  third_party/
+
+Build files:
+  libweave_standalone.gyp
+  libweave_common.gypi
+
+ChromiumOS specific build files:
+  libweave-test.pc.in
+  libweave.pc.in
+  platform2.gyp
+  platform2_preinstall.sh
+
+AOSP specific build files:
+  Android.mk
+
+Quick start on Ubuntu
+---------------------
+
+Install prerequisites:
+
+  examples/ubuntu/prerequisites.sh
+
+Build library, tests, run tests, build example:
+
+  examples/ubuntu/build.sh
+
+Execute example:
+
+  sudo out/Debug/weave
+
+
+Prerequisites
+-------------
+Common:
+
+  autoconf
+  automake
+  binutils
+  libtool
+  gyp
+  libexpat1-dev
+  ninja-build
+
+For tests:
+
+  gtest
+  gmock
+
+For examples:
+
+  hostapd
+  libavahi-client-dev
+  libcurl4-openssl-dev
+  libevent 2.1.x-alpha
+
+
+Compiling
+---------
+Everywhere below Debug can be replaced with Release.
+
+Generate ninja build files:
+
+  gyp -I libweave_common.gypi --toplevel-dir=. \
+      -f ninja libweave_standalone.gyp
+
+Build library with tests:
+
+  ninja -C out/Debug
+
+Build library only:
+
+  ninja -C out/Debug libweave
+
+Testing
+-------
+Run unittests tests:
+
+  out/Debug/libweave_testrunner
+  out/Debug/libweave_exports_testrunner
+
+Making changes
+--------------
+Make sure to have correct user in local or global config e.g.:
+
+  git config --local user.name "John Doe"
+  git config --local user.email johndoe@example.com
+
+Edit code and commit locally e.g.:
+
+  git commit -a -v
+
+Upload CL:
+
+  git push origin HEAD:refs/for/master
+
+Go to the url from the output of "push" and add reviewers.