Add new documentation for the Bazel helper

Author: tapia

.gitignore

@@ -23,6 +23,7 @@ var/
 *.egg-info/
 .installed.cfg
 *.egg
+venv
 
 # PyInstaller
 #  Usually these files are written by a python script from a template

images/conan-bazel_logo.png

@@ -31,3 +31,4 @@ Conan can be integrated with any build system. This can be done with:
    build_system/meson
    build_system/scons
    build_system/gcc
+   build_system/bazel

integrations/build_system.rst

@@ -0,0 +1,40 @@
+.. _bazel:
+
+
+|bazel_logo| Bazel
+__________________
+
+If you are using **Bazel** as your library build system, you can use the **Bazel** build helper.
+This helper has a .build()`` method available to ease the call to Meson build system.
+
+If you want to declare Conan dependencies in your project, you must do it, as usual, in the
+**conanfile.py** file. For example:
+
+.. code-block:: python
+
+    class BazelExampleConan(ConanFile):
+        name = "bazel-example"
+        ....
+        build_requires = "boost/1.76.0"
+
+Then, tell Bazel to use that dependencies by adding this to the **WORKSPACE** file:
+
+.. code-block:: text
+
+    load("@//conandeps:dependencies.bzl", "load_conan_dependencies")
+    load_conan_dependencies()
+
+After that, just update the BUILD files where you need to use the new dependency:
+
+.. code-block:: text
+
+    cc_binary(
+        name = "hello-world",
+        srcs = ["hello-world.cc"],
+        deps = [
+            "@boost//:boost",
+        ],
+    )
+
+
+.. |bazel_logo| image:: ../../images/conan-bazel_logo.png

integrations/build_system/bazel.rst

@@ -37,6 +37,7 @@ Contents:
 
    tools/cmake
    tools/gnu
+   tools/google
    tools/meson
    tools/microsoft
    tools/qbs

reference/conanfile/tools.rst

@@ -0,0 +1,78 @@
+.. _conan_tools_google:
+
+conan.tools.google
+==================
+
+.. warning::
+
+    These tools are **experimental** and subject to breaking changes.
+
+
+BazelDeps
+---------
+
+Available since: `1.37.0 <https://github.com/conan-io/conan/releases/tag/1.37.0>`_
+
+The ``BazelDeps`` helper will generate one **conandeps/xxxx/BUILD** file per dependency. This dependencies will be
+automatically added to the project by adding the following to the project's **WORKSPACE** file:
+
+
+.. code-block:: text
+
+    load("@//conandeps:dependencies.bzl", "load_conan_dependencies")
+    load_conan_dependencies()
+
+
+The dependencies should be added to the **conanfile.py** file as usual:
+
+.. code-block:: python
+
+    class BazelExampleConan(ConanFile):
+        name = "bazel-example"
+        ...
+        generators = "BazelDeps", "BazelToolchain"
+        build_requires = "boost/1.76.0"
+
+Bazel
+-----
+The ``Bazel`` build helper is a wrapper around the command line invocation of bazel. It will abstract the
+calls like ``bazel build //main:hello-world`` into Python method calls.
+
+The helper is intended to be used in the ``build()`` method, to call Bazel commands automatically
+when a package is being built directly by Conan (create, install)
+
+
+.. code-block:: python
+
+    from conans import ConanFile
+    from conan.tools.google import Bazel
+
+    class App(ConanFile):
+        settings = "os", "arch", "compiler", "build_type"
+
+        def build(self):
+            bazel = Bazel(self)
+            bazel.configure()
+            bazel.build(label="//main:hello-world")
+
+It supports the following methods:
+
+constructor
++++++++++++
+
+.. code:: python
+
+    def __init__(self, conanfile):
+
+- ``conanfile``: the current recipe object. Always use ``self``.
+
+
+build()
++++++++
+
+.. code:: python
+
+    def build(self, args=None, label=None):
+
+
+Calls the build system. Equivalent to :command:`bazel build {label}` in the build folder.