Add the "Ebuild: Snapshots" page.

Author: paveloom

content/notes/Ebuild_Snapshots.md

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+title = "Ebuild: Snapshots"
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+
+There are two ways to name an ebuild which packages a snapshot version of a source repository:
+
+1. `${last_released_version}_pYYYYMMDD`: treat the snapshot as a patch to the last released version.
+
+2. `${upcoming_version}_preYYYYMMDD`: treat the snapshot as a prerelease of an upcoming version.
+
+It's common to assume `$upcoming_version` to be `0` or `0.0.1` for repositories without tags.
+
+See [Gentoo Devmanual: Snapshots and live ebuilds](https://devmanual.gentoo.org/ebuild-writing/file-format/index.html#snapshots-and-live-ebuilds).