7zr: add page (based on 7za)

pages/common/7zr.md

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+# 7zr
+
+> A file archiver with high compression ratio.
+> A standalone version of `7z` that only supports .7z files.
+
+- Compress directory or file:
+
+`7zr a {{compressed.7z}} {{directory_or_file_to_compress}}`
+
+- Decompress an existing 7z file with original directory structure:
+
+`7zr x {{compressed.7z}}`
+
+- Create multipart 7zip file; `part_size` specifies part size in Bytes, Kilobytes, Megabytes or Gigabytes:
+
+`7zr -v{{part_size}}{{[b|k|m|g]}} {{compressed.7z}} {{directory_or_file_to_compress}}`