7za: add page

pages/common/7za.md

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+# 7za
+
+> A file archiver with high compression ratio
+
+- compress directory or file
+
+`7za a {{compressed.7z}} {{directory_or_file_to_compress}}`
+
+- decompress an existing 7z file with original directory structure
+
+`7za x {{compressed.7z}}`
+
+- compress to zip format
+
+`7za a -tzip {{compressed.zip}} {{directory_or_file_to_compress}}`
+
+- create multipart 7zip file; `part_size` specifies part size in Bytes, Kilobytes, Megabytes or Gigabytes.
+
+`7za -v{{part_size}}{{[b|k|m|g]}} {{compressed.7z}} {{directory_or_file_to_compress}}`