Add ChangeLog file.

* ChangeLog: New file.

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+2021-09-16  Masaya Tojo  <masaya@tojo.tokyo>
+
+	Replace from core-system/equal to core-system/equal-t-nil.
+
+	fixup!
+
+	Add `*~` to `.gitignore` file.
+
+	Remove sys variables.
+
+2021-09-15  Masaya Tojo  <masaya@tojo.tokyo>
+
+	Display (system-check system) with pretty-print.
+
+	Return (system-check system) when evaluate define-system.
+
+	Version up from 0.1.1 to 0.2.0.
+
+	Add core-system/equal system.
+
+	fixup!
+
+	Change `define-system` interface.
+
+	Rename syntax from `set` to `=`.
+
+2021-01-19  Masaya Tojo  <masaya@tojo.tokyo>
+
+	Upgrade version to 0.1.1.
+
+	Update synopsis and description.
+
+	Add tests.
+
+	Add `vikalpa.scm`.
+
+	Initial commit.
+	* COPYING: New file.
+	* Makefile.am: New file.
+	* README.org: New file.
+	* README.md: Delete file.
+	* bootstrap: New file.
+	* build-aux/test-driver.scm: New file.
+	* configure.ac: New file.
+	* guix.scm: New file.
+	* pre-inst-env.in: New file.
+	* rabbit-prover.scm: New file.
+	* toot.scm: New file.