chore: add README.md

README.md

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+# Crimson Vault
+
+Simple invoicing solution for small businesses that is open source and self-hosted written in Go.
+
+# Development
+
+This project uses [Air](https://github.com/air-verse/air) for live reloading so you can simply run the following command to get reloading on save:
+
+```
+air
+```
+
+For migrations the project is using [Atlas GORM Provider](https://github.com/ariga/atlas-provider-gorm) for migrations. To save a migration run the follwing command:
+
+```
+atlas migrate diff --env gorm
+```
+
+And to apply a migration on your development database you will need to run the following command:
+
+```
+atlas schema apply --env gorm -u "your database connection string"
+```