Add ghq commands

specs/ghq/create-a-repository-ghq.yaml

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+name: Create new repository
+command: |-
+    ghq create {{repository_name}}
+tags:
+  - ghq
+description: Creates new repository.
+source_url: "https://github.com/x-motemen/ghq"
+author: nagauta
+author_url: "https://github.com/nagauta"
+shells: []

specs/ghq/get-root-ghq.yaml

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+name: Print repositories' root
+command: |-
+    ghq root
+tags:
+  - ghq
+description: Print repositories' root (i.e., `ghq.root`). Without '--all' option, the primary one is shown.
+source_url: "https://github.com/x-motemen/ghq"
+author: nagauta
+author_url: "https://github.com/nagauta"
+shells: []

specs/ghq/list-repositories-ghq.yaml

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+---
+name: List Repositories managed by ghq
+command: "ghq list"
+tags:
+  - ghq
+description: List Repositories managed by ghq
+source_url: "https://github.com/x-motemen/ghq"
+author: nagauta
+author_url: "https://github.com/nagauta"
+shells: []

specs/ghq/romove-a-repository-ghq.yaml

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+name: Remove local repository
+command: |-
+    ghq rm {{repository_name}}
+tags:
+  - ghq
+description: Remove local repository. If '--dry-run' option is given, the repository is not actually removed but the path to it is printed.
+arguments:
+  - name: repository_name
+    description: The name of the repository to be removed. optionally with --dry-run, the repository is not actually removed but the path to it is printed. (e.g., )
+    default_value: ~
+source_url: "https://github.com/x-motemen/ghq"
+author: nagauta
+author_url: "https://github.com/nagauta"
+shells: []