gh-search: add page (#18339)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/common/gh-search.md

@@ -0,0 +1,36 @@
+# gh search
+
+> Search across all of GitHub.
+> More information: <https://cli.github.com/manual/gh_search>.
+
+- Search for code containing specific keywords:
+
+`gh search code {{keyword1 keyword2 ...}}`
+
+- Search for issues with a specific phrase:
+
+`gh search issues "{{search_phrase}}"`
+
+- Search commits by a specific author:
+
+`gh search commits --author {{username}}`
+
+- Search pull requests assigned to yourself that are still open:
+
+`gh search prs --assignee @me --state open`
+
+- Search repositories in an organization by topic:
+
+`gh search repos --owner {{org_name}} --topic {{topic_name}}`
+
+- Search issues without a certain label (Unix-like systems):
+
+`gh search issues -- "{{search_query}} -label:{{label_name}}"`
+
+- Search issues without a certain label (PowerShell):
+
+`gh --% search issues -- "{{search_query}} -label:{{label_name}}"`
+
+- Open the search query in the web browser:
+
+`gh search {{subcommand}} {{[-w|--web]}} {{query}}`