[Doc] Add release notes file

Author: AmirAbrams

releasenotes.md

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+## Release History
+
+Change History (v1.0.2):
+- [Security] Bump acorn from 5.7.3 to 5.7.4
+- [Security] Bump handlebars from 4.2.0 to 4.7.6
+- Bump react from 16.8.6 to 16.13.1
+- Bump @babel/preset-react from 7.0.0 to 7.9.4
+- Bump pShare version to 1.0.2
+- Add release notes file
+
+Change History (v1.0.1):
+- Remove file size limit warning in UI
+- Close about menu when main windows is closed
+- [Docs] Add Snyk vulnerabilities and Travis build badges to main readme file 
+- [Security] Bump electron from 3.0.10 to 3.0.16
+- [Security] Bump lodash-es from 4.17.11 to 4.17.15
+- Bump qrcode-generator from 1.4.3 to 1.4.4
+- Bump react from 16.8.6 to 16.12.0
+- Bump seedrandom from 2.4.4 to 3.0.5
+- Bump pShare version from 1.0.0 to 1.0.1
+- Update badges in readme file
+- Update verbiage on mnemonic page
+- Update text for restore file
+- Fix Travis CI build errors