Add release documentation

Author: donny-dont

RELEASING.md

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+# Creating a release
+
+The WinCairoRequirements repository uses GitHub releases to host a distribution
+which are then downloaded by scripts contained in the WebKit repository. By
+default the latest release will be downloaded when doing a WebKit build. Each
+release corresponds to a tag within the git repository.
+
+## Tag names
+
+Tags are done based on the date of creation of the distribution. This is done
+because the third party requirements change sporatically and semantic
+versioning does not fit with the distribution. This provides a clear timeline
+on when the requirements changed.
+
+## Creating the tag
+
+To create the tag have the commit that is being released checked out locally.
+From there run the following commands where YYYY.MM.DD corresponds to the year
+month and day the tag is created.
+
+```
+git tag -a vYYYY.MM.DD -m "vYYYY.MM.DD"
+git push origin vYYYY.MM.DD
+```
+
+Once the tag is pushed a release can be created within GitHub.
+
+# Manually creating a distribution
+
+The repository contains a number of scripts to create a distribution. These are used to build locally consistently.
+
+All the scripts take a `triplet` value which specifies the toolchain. By
+default the `x64-windows-webkit` toolchain is used. For building 
+WinCairoRequirements two toolchain files were created because there are some
+libraries that need to be built statically even when a dynamic build is wanted.
+Only the `x64-windows-webkit` toolchain is supported at this time.
+
+## Install script
+
+The `Install-Requirements.ps1` script is a wrapper around `vcpkg` which will
+invoke `vcpkg install` with a list of requirements. The requirements are
+defined in a .json file which is nothing more than a list of port names.
+
+## Renaming bin/lib
+
+The WebKit Windows port assumes that the bin and lib directory both contain a
+suffix for whether it is a 64-bit or 32-bit build. The
+`Rename-WithBitSuffix.ps1` script will rename according to the triplet passed
+in.
+
+## Creating the zip
+
+The `Package-Requirements.ps1` script creates a zip file containing the
+dependencies. If a different filename is required then set the `-Output` flag
+accordingly.
+
+## Command listing
+
+```
+& Install-Requirements.ps1
+
+# TODO Remove
+.\vcpkg.exe install cflite --triplet x64-windows-webkit
+& Delete-PthreadHeaders.ps1
+
+& Package-Requirements.ps1
+```