git-diff-index, git-diff-tree: add page

pages/common/git-diff-index.md

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+# git diff-index
+
+> Compare the working directory with a specific commit or tree object.
+> More information: <https://git-scm.com/docs/git-diff-index>.
+
+- Compare the working directory with a specific commit:
+
+`git diff-index {{commit}}`
+
+- Compare a specific file or directory in working directory with a commit:
+
+`git diff-index {{commit}} {{path/to/file_or_directory}}`
+
+- Compare the working directory with the index (staging area) to check for staged changes:
+
+`git diff-index --cached {{commit}}`
+
+- Suppress output and return an exit status to check for differences:
+
+`git diff-index --quiet {{commit}}`

pages/common/git-diff-tree.md

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+# git diff-tree
+
+> Compares the content and mode of blobs found via two tree objects.
+> More information: <https://git-scm.com/docs/git-diff-tree>.
+
+- Compare two tree objects:
+
+`git diff-tree {{tree-ish1}} {{tree-ish2}}`
+
+- Show changes between two specific commits:
+
+`git diff-tree -r {{commit1}} {{commit2}}`
+
+- Display changes in patch format:
+
+`git diff-tree -p {{tree-ish1}} {{tree-ish2}}`
+
+- Filter changes by a specific path:
+
+`git diff-tree {{tree-ish1}} {{tree-ish2}} -- {{path/to/file_or_directory}}`