Add 7.7 shared versions file (#1785)

Author: lcawl

shared/versions/stack/7.7.asciidoc

@@ -0,0 +1,30 @@
+:version:                7.7.0
+////
+bare_version never includes -alpha or -beta
+////
+:bare_version:           7.7.0
+:logstash_version:       7.7.0
+:elasticsearch_version:  7.7.0
+:kibana_version:         7.7.0
+:apm_server_version:     7.7.0
+:branch:                 7.7
+:major-version:          7.x
+:prev-major-version:     6.x
+:ecs_version:            1.4
+
+//////////
+release-state can be: released | prerelease | unreleased
+//////////
+
+:release-state:          unreleased
+
+////
+APM Agent versions
+////
+:apm-go-branch:         1.x
+:apm-java-branch:       1.x
+:apm-rum-branch:        5.x
+:apm-node-branch:       3.x
+:apm-py-branch:         5.x
+:apm-ruby-branch:       3.x
+:apm-dotnet-branch:     1.x

shared/versions/stack/7.x.asciidoc

@@ -1,12 +1,12 @@
-:version:                7.7.0
+:version:                7.8.0
 ////
 bare_version never includes -alpha or -beta
 ////
-:bare_version:           7.7.0
-:logstash_version:       7.7.0
-:elasticsearch_version:  7.7.0
-:kibana_version:         7.7.0
-:apm_server_version:     7.7.0
+:bare_version:           7.8.0
+:logstash_version:       7.8.0
+:elasticsearch_version:  7.8.0
+:kibana_version:         7.8.0
+:apm_server_version:     7.8.0
 :branch:                 7.x
 :major-version:          7.x
 :prev-major-version:     6.x