[Docs] add markdown docs (converted from Wiki)

BUG=none
R=mark
CC=google-breakpad-dev@googlegroups.com

Review URL: https://codereview.chromium.org/1357773004 .

Patch from Andy Bonventre <andybons@chromium.org>.

1 files changed, 47 insertions, 0 deletions

diff --git a/README.md b/README.md
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+# Breakpad
+
+Breakpad is a set of client and server components which implement a
+crash-reporting system.
+
+## Getting started in 32-bit mode (from trunk)
+
+```sh
+# Configure
+CXXFLAGS=-m32 CFLAGS=-m32 CPPFLAGS=-m32 ./configure
+# Build
+make
+# Test
+make check
+# Install
+make install
+```
+
+If you need to reconfigure your build be sure to run `make distclean` first.
+
+## To request change review:
+
+1.  Get a copy of depot_tools repo.
+    http://dev.chromium.org/developers/how-tos/install-depot-tools
+
+2.  Create a new directory for checking out the source code.
+    mkdir breakpad && cd breakpad
+
+3.  Run the `fetch` tool from depot_tools to download all the source repos.
+    `fetch breakpad`
+
+4.  Make changes. Build and test your changes.
+    For core code like processor use methods above.
+    For linux/mac/windows, there are test targets in each project file.
+
+5.  Commit your changes to your local repo and upload them to the server.
+    http://dev.chromium.org/developers/contributing-code
+    e.g. `git commit ... && git cl upload ...`
+    You will be prompted for credential and a description.
+
+6.  At https://codereview.chromium.org/ you'll find your issue listed; click on
+    it, and select Publish+Mail, and enter in the code reviewer and CC
+    google-breakpad-dev@googlegroups.com
+
+## Documentation
+
+Visit https://chromium.googlesource.com/breakpad/breakpad/+/master/docs/