Add Changelog.md

Changelog.md

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+# Changelog
+
+## Upcoming Changes
+
+## Version 1.0
+
+First release.
+
+Features:
+
+  - Can specify any command as de/compressor when archiving.
+      - The commands must accept file data in stdin and output processed data to
+        stdout.
+  - Can specify any command as decompressor when extracting to override the
+    simple-archive's stored decompressor.
+  - Archives/compresses into chunks to reduce overhead by compressing per chunk
+    instead of per file.
+  - Chunk size can be tweaked by a parameter setting.
+  - Can archive without de/compressor to be compressed separately.
+  - Supports pre-version-1 simple archiver file format (version 0).
+  - Archives regular files and symlinks.
+  - Keeps track of files and symlink permissions.
+  - Keeps track of file UID and GID (only set if extracting as root).
+  - Can be set to ignore absolute paths for symlinks by parameter setting.