Add PLATFORM_SUPPORT document (#84)

Signed-off-by: JLBuenoLopez-eProsima <[email protected]>

Author: JLBuenoLopez

PLATFORM_SUPPORT.md

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+# Platform Support
+
+This document reflects the level of support offered by **eProsima Fast CDR** on different platforms as per the following
+definitions:
+
+## Tier 1
+
+Tier 1 platforms are subjected to our unit test suite and other testing tools on a frequent basis including continuous
+integration jobs and nightly jobs.
+Errors or bugs discovered in these platforms are prioritized for correction by the development team.
+Significant errors discovered in Tier 1 platforms can impact release dates and we strive to resolve all known high
+priority errors in Tier 1 platforms prior to new version releases.
+
+## Tier 2
+
+Tier 2 platforms are subject to periodic CI testing which runs both builds and tests with publicly accessible results.
+The CI is expected to be run at least within a week of relevant changes for the current release of **Fast CDR**.
+Installation instructions should be available and up-to-date in order for a platform to be listed in this category.
+Package-level binary packages may not be provided but providing a downloadable archive of the built workspace is
+encouraged.
+Errors may be present in released product versions for Tier 2 platforms.
+Known errors in Tier 2 platforms will be addressed subject to resource availability on a best effort basis and may or
+may not be corrected prior to new version releases.
+One or more entities should be committed to continuing support of the platform.
+
+## Tier 3
+
+Tier 3 platforms are those for which community reports indicate that the release is functional.
+The development team does not run the unit test suite or perform any other tests on platforms in Tier 3.
+Community members may provide assistance with these platforms.
+
+## Platforms
+
+|Architecture|Ubuntu Focal (20.04)|MacOS Mojave (10.14)|Windows 10 (VS2019)|Debian Buster (10)|
+|------------|--------------------|--------------------|-------------------|------------------|
+|amd64       |Tier 1 [a][s]       |Tier 1 [s]          |Tier 1 [a][s]      |Tier 3 [s]        |
+|amd32       |                    |                    |Tier 1 [a][s]      |                  |
+|arm64       |Tier 1 [a][s]       |                    |                   |Tier 3 [s]        |
+|arm32       |Tier 3 [s]          |                    |                   |Tier 3 [s]        |
+
+" [a] " Binary releases are provided as a single archive per platform.\
+" [s] " Compilation from source.
+
+Other Tier 3 OS:
+
+* FreeBSD
+* VxWorks
+* QNX