Add a bare bones changelog

CHANGELOG.md

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+## Changelog
+
+Full commit history per tag: https://github.com/vpenso/prometheus-slurm-exporter/commits/{tag number}
+
+* **0.19**
+- Merge PR#50
+
+* **0.18**
+- Add CPU/Memory info per node (see PR#47)
+
+* **0.17**
+- Add fair share collector
+
+* **0.16**
+- Export more data per account/partition, fix squeue for pending jobs
+- Merge PR#34
+
+* **0.15**
+- CPU allocation status per partition
+
+* **0.14**
+- add stats about jobs per account/per user
+
+* **0.13**
+-  Merge pull request #32 from pdtpartners/faster-node-metrics
+
+* **0.12**
+- Merge pull request #30 from omnivector-solutions/add_snap_packaging
+
+* **0.11**
+- Merge PR#29
+- Add more backfill stats (see PR#27)
+
+* **0.10**
+- Scheduler: keep track of the DBD agent queue size
+
+* **0.9**
+- README: update to fix build problem raised with issue #26
+
+* **0.8**
+- Merge pull request #21 from cleargray/command-paths
+
+* **0.7**
+- Update scheduler.go (fix issue #18)
+
+* **0.6**
+- Merge pull request #13 from rug-cit-hpc/master
+
+* **0.5**
+- [BUG]: count all job states (issue #9)
+
+* **0.4**
+- Merge pull request #8 from MatMaul/pending-dep
+
+* **0.3**
+- Fix issue #4
+
+* **0.2**
+- Fix issue #3
+
+* **0.1** 
+- Basic prototype
+- Merge PR#2
+- Add Grafana dashboard