Windows pip installation guide (#4736)

* added initial steps

* fixing link

* python3 -> python

* remaining steps

* steps updated

* Update docs/intro/install.rst
Co-authored-by: NAdrián Chaves <adrian@chaves.io>

* added link to Visual Studio

* removed 'install V'

* Update docs/intro/install.rst
Co-authored-by: NAdrián Chaves <adrian@chaves.io>
Co-authored-by: NAdrián Chaves <adrian@chaves.io>

docs/intro/install.rst

@@ -12,6 +12,7 @@ Supported Python versions
 Scrapy requires Python 3.6+, either the CPython implementation (default) or
 the PyPy 7.2.0+ implementation (see :ref:`python:implementations`).
 
+.. _intro-install-scrapy:
 
 Installing Scrapy
 =================
@@ -29,13 +30,13 @@ you can install Scrapy and its dependencies from PyPI with::
 
     pip install Scrapy
 
+We strongly recommend that you install Scrapy in :ref:`a dedicated virtualenv <intro-using-virtualenv>`,
+to avoid conflicting with your system packages.
+
 Note that sometimes this may require solving compilation issues for some Scrapy
 dependencies depending on your operating system, so be sure to check the
 :ref:`intro-install-platform-notes`.
 
-We strongly recommend that you install Scrapy in :ref:`a dedicated virtualenv <intro-using-virtualenv>`,
-to avoid conflicting with your system packages.
-
 For more detailed and platform specifics instructions, as well as
 troubleshooting information, read on.
 
@@ -117,6 +118,27 @@ Once you've installed `Anaconda`_ or `Miniconda`_, install Scrapy with::
 
   conda install -c conda-forge scrapy
 
+To install Scrapy on Windows using ``pip``:
+
+.. warning::
+    This installation method requires “Microsoft Visual C++” for installing some 
+    Scrapy dependencies, which demands significantly more disk space than Anaconda.
+
+#. Download and execute `Microsoft C++ Build Tools`_ to install the Visual Studio Installer.
+
+#. Run the Visual Studio Installer.
+
+#. Under the Workloads section, select **C++ build tools**.
+
+#. Check the installation details and make sure following packages are selected as optional components:
+
+    * **MSVC**  (e.g MSVC v142 - VS 2019 C++ x64/x86 build tools (v14.23) )
+    
+    * **Windows SDK**  (e.g Windows 10 SDK (10.0.18362.0))
+
+#. Install the Visual Studio Build Tools.
+
+Now, you should be able to :ref:`install Scrapy <intro-install-scrapy>` using ``pip``.
 
 .. _intro-install-ubuntu:
 
@@ -268,4 +290,6 @@ For details, see `Issue #2473 <https://github.com/scrapy/scrapy/issues/2473>`_.
 .. _zsh: https://www.zsh.org/
 .. _Anaconda: https://docs.anaconda.com/anaconda/
 .. _Miniconda: https://docs.conda.io/projects/conda/en/latest/user-guide/install/index.html
+.. _Visual Studio: https://docs.microsoft.com/en-us/visualstudio/install/install-visual-studio
+.. _Microsoft C++ Build Tools: https://visualstudio.microsoft.com/visual-cpp-build-tools/
 .. _conda-forge: https://conda-forge.org/