add CHANGELOG.md

CHANGELOG.md

+# Change Log
+All notable changes to this project will be documented in this file.
+
+
+## v0.8.0 [Unreleased]
+
+
+### Added
+#### JPSEditor  
+
+- Point Grid
+- Line Grid
+- Select all lines
+- Edit Room Type
+- Show and snap the origin
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