add Backblaze B2 (#418)

add Backblaze B2

docs/remote_services/s3_backblaze_b2/README.md

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+# Backblaze B2
+
+## Links
+
+https://www.backblaze.com/cloud-storage
+
+## Steps
+
+1. Create a Backblaze account [on this page](https://www.backblaze.com/cloud-storage). Credit card info *is not* required. Backblaze B2 offers 10 GB of free storage.
+2. Create a **bucket**, you can leave the default settings:
+   ![](./s3_backblaze_b2-1-bucket.png)
+   ![](./s3_backblaze_b2-2-create_bucket.png)
+4. Copy `Endpoint`, eg. `s3.us-east-005.backblazeb2.com` — it'll be used later.
+5. Copy `bucketname` near the 🪣 icon — it'll be used later.
+   ![](./s3_backblaze_b2-3-copy.png)
+6. Go to **Application Keys**:
+
+     ![](./s3_backblaze_b2-4-app_keys.png)
+
+8. **Add a new key**: 
+   ![](./s3_backblaze_b2-5-add_new_app_keys.png)
+   ![](./s3_backblaze_b2-6-app_keys_copy.png)
+9. Save `keyID` and `applicationKey` — they will be used later.
+10. Go to Remotely Save settings in Obsidian and: 
+	- Choose `S3 or compatibile` in **Remote Service**:
+	- Copy `Endpoint` from Backblaze (see 3. above) to `Endpoint` in Remotely Save
+	- From `endpoint` take `region` (eg. `us-east-005`) and paste it in `endpoint` in Remotely Save
+	- Copy `keyID` (see 7. above) to `Access Key ID` in Remotely Save
+	- Copy `applicationKey` (see 7. above) to `Secret Access Key` in Remotely Save
+	- Copy `bucketname` (see 4. above) to `Bucket Name` in Remotely Save
+	  ![](./s3_backblaze_b2-7-copy_paste.png)
+
+11. **Enable CORS**:
+   ![](./s3_backblaze_b2-8-cors.png)
+
+12. Click **Check** in _Check Connectivity_ to see if you can connect to B2 bucket:
+	![](./s3_backblaze_b2-9-check_connectionpng.png)
+
+13. Sync!
+
+  ![](./s3_backblaze_b2-10-sync.png)

docs/remote_services/s3_backblaze_b2/s3_backblaze_b2-1-bucket.png

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