[Olympus] Add release guide for olympus

RELEASE_GUIDE_OLYMPUS.md

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+# Filament Release Guide
+
+- $VERSION = the current version that has been released (e.g. 1.10.7)
+- $NEXT_VERSION = the next version we plan to release (e.g. 1.10.8)
+- $PATCH_VERSION = the minor version on top of filament version (e.g. 1.10.7-__p0__)
+
+## Release a new filament version for olympus
+
+### 1. keep track of our changes in the current release
+
+- compare the current olympus release branch `elisemorysc/filament:olympus-$VERSION` with the upstream filament release `google/filament:v$VERSION` (e.g. https://github.com/google/filament/compare/v1.10.7...elisemorysc:olympus-1.10.7)
+- we should see the hunterization commit marked `[Hunter]`
+- we should see the olympus changes marked `[Olympus]`
+
+### 2. create new release branch
+
+- create a new branch `elisemorysc/filament:olympus-$NEXT_VERSION` from the upstream filament version (e.g. `google/filament:v1.10.8` -> `elisemorysc/filament:olympus-1.10.8`)
+- cherry pick in our changes from the last step
+- solve any conflicts
+
+### 3. cut new release
+
+- cut a new release `olympus-$NEXT_VERSION-$PATH_VERSION` (e.g. `olympus-1.10.8-p0`) from the new branch
+
+## Release a new filament version for hunter
+
+- create a new branch `elisemorysc/filament:hunter-$NEXT_VERSION` from the upstream filament version (e.g. `google/filament:v1.10.8` -> `elisemorysc/filament:hunter-1.10.8`)
+- cherry pick in the hunterization commit marked `[Hunter]` from the current olympus release `elisemorysc/filament:olympus-$VERSION`
+- solve any conflicts
+- put up a PR against the hunter repo for filament `cpp-pm/filament:hunter-$NEXT_VERSION`