add DATA_RELEASE_NOTES for release 1.1 (#1, #2, #3, #4, #5, #7, #9, #12)

DATA_RELEASE_NOTES.md

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+# Release notes for the *IAMC 1.5°C Scenario Explorer and Data hosted by IIASA*
+
+This document keeps track of the data changes of the scenario ensemble
+compiled in the *IAMC 1.5°C Scenario Explorer and Data hosted by IIASA*.
+
+
+## Release 1.1
+
+This release includes additional timeseries data to increase reproducibility
+of the figures and tables in the IPCC SR15, and it corrects a number of
+data issues identified since Release 1.0. None of the changes have
+any impact on the assessment in the IPCC SR15.
+
+### Detailed list of changes
+
+ - Reporting error for primary energy from fossils (aggregate) submitted by
+ the 'MESSAGE-GLOBIOM 1.0' scenarios as part of the 'EMF33' project.
+ See [#1](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/1)
+ for details.
+
+ - Typo in a variable name and incorrect values in two timeseries of 
+ the reference data from 'IEA Statistics' included in the release.
+ See [#2](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/2)
+ for details.
+
+ - Missing subsectoral CO2 emissions for scenarios from the SSP, CD-LINKS
+ and LED projects.
+ See [#3](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/3)
+ and [#4](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/4)
+ for details.
+
+ - Missing timeseries of harmonized emissions as used for climate impact
+ assessment by the MAGICC and FAIR models.
+ See [#5](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/5)
+ for details.
+
+ - Error in index year for the variable 'Price|Agriculture|*' in scenarios
+ submitted by the 'AIM' model.
+ See [#7](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/7)
+ for details.
+
+ - Missing value for cumulative BECCS in the metadata for
+ the 'LowEnergyDemand' scenario submitted by the 'MESSAGEix-GLOBIOM' model.
+ See [#9](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/9)
+ for details.
+
+ - Incorrect regional data (other than 'World') for scenario submitted
+ by the 'POLES' model as part ofthe 'EMF33' project.
+ See [#12](https://github.com/iiasa/ipcc_sr15_scenario_analysis/issues/12)
+ for details.
+
+
+## Release 1.0
+
+Scenario ensemble release for the soft launch of the IPCC SR15
+following the approval plenary in Incheon, Republic of Korea.