Create release-notes-v1_2_0.md

Author: UrszulaNeuman

docs/release-notes/release-notes-v1_2_0.md

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+Release Notes (v1.2.0)
+===========================
+
+Summary of all changes
+----------------------
+| Jira Task | GitHub Issue | Type | Description |
+|-----------|--------------|------|-------------|
+| I04_1-274 | [#52](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/52) | Patch | Fixed system tests |
+| I04_1-272 | [#54](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/54) | Patch | Fixed cammera settings button|
+| I04_1-162 | [#56](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/56) | Patch | Fixed slow Travis build|
+| I04_1-268 | [#58](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/58) | Minor | Imporved the puck orientation algorithm|
+| I04_1-270 | [#59](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/59) | Minor | Improved the puck orientation algorithm - should work even for one pin|
+
+
+Change Types:
+* Major - Backward incompatible change
+* Minor - Backward compatible change in API/functionality
+* Patch - Bug fix, no change in functionality
+