Link Client SDK page to Third Party SDKs

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug
/kind cleanup

/kind documentation

/kind feature
/kind hotfix

What this PR does / Why we need it:

Wanted to make the third party SDKs more discoverable, in case the supported set didn't match a user's needs.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

N/A

[agones-bot]

Build Failed 😱

Build Id: bf755fe1-c438-435a-8ad3-b5932aa82d65

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[markmandel]

Seems like e2e is being a bit flaky again. Seeing GameServers that aren't moving to Ready.

time="2021-05-06 20:08:22.118" level=info msg="fleet preferred-lnvbl has 0/1 ready replicas"
time="2021-05-06 20:08:24.119" level=info msg="fleet preferred-lnvbl has 0/1 ready replicas"
time="2021-05-06 20:08:26.120" level=info msg="fleet preferred-lnvbl has 0/1 ready replicas"
time="2021-05-06 20:08:26.159" level=info msg="fleet preferred-lnvbl has 0/1 ready replicas"
time="2021-05-06 20:08:26.159" level=info msg="error waiting for fleet condition" error="timed out waiting for the condition" fleet=preferred-lnvbl
--- FAIL: TestGameServerAllocationPreferredSelection (391.77s)
    gameserverallocation_test.go:379: error waiting for fleet condition on fleet preferred-lnvbl
FAIL
time="2021-05-06 20:08:26.417" level=info msg="sent UDP packet" address="34.82.230.193:7082" test=TestGameServerUnhealthyAfterReadyCrash
time="2021-05-06 20:08:26.532" level=info msg="Namespace 1620331204 is deleted"
FAIL	agones.dev/agones/test/e2e	502.532s
FAIL

[agones-bot]

Build Succeeded 👏

Build Id: d0c425d2-72a8-4855-ad96-9766c1319c73

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.15.0-83b1a50
• image: gcr.io/agones-images/agones-ping:1.15.0-83b1a50
• Linux C++ SDK (build): agonessdk-1.15.0-83b1a50-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.15.0-83b1a50.zip

A preview of the website (the last 30 builds are retained):

• https://83b1a50-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2094/head:pr_2094 && git checkout pr_2094
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.15.0-83b1a50

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markmandel, roberthbailey

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• OWNERS [markmandel,roberthbailey]

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