hg-clone: add page

pages/common/hg-clone.md

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+# hg clone
+
+> Create a copy of an existing repository in a new directory.
+
+- Clone a repository to a specified directory:
+
+`hg clone {{remote_repository_source}} {{destination_path}}`
+
+- Clone a repository on a specific branch:
+
+`hg clone --branch {{branch}} {{remote_repository_source}}`
+
+- Clone a repository with a clean working directory:
+
+`hg clone --noupdate {{remote_repository_source}}`
+
+- Clone a repository to a specific revision, tag or branch:
+
+`hg clone --updaterev {{revision}} {{remote_repository_source}}`
+
+- Clone a repository up to a specific revision without any newer history:
+
+`hg clone --rev {{revision}} {{remote_repository_source}}`