add README.md file

README.md

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-# atlas-provider-typeorm
+# atlas-provider-typeorm
+
+![CI](https://github.com/ariga/atlas-provider-typeorm/actions/workflows/ci.yaml/badge.svg)
+
+Load [Typeorm](https://typeorm.io/) entities into an [Atlas](https://atlasgo.io) project.
+
+## Use-cases
+1. **Declarative migrations** - use a Terraform-like `atlas schema apply --env typeorm` to apply your Typeorm entities to the database.
+2. **Automatic migration planning** - use `atlas migrate diff --env typeorm` to automatically plan a migration from the current database version to the Typeorm schema.
+
+## Installation
+
+Install Atlas from macOS or Linux by running:
+```bash
+curl -sSf https://atlasgo.sh | sh
+```
+See [atlasgo.io](https://atlasgo.io/getting-started#installation) for more installation options.
+
+Install the provider by running:
+```bash
+npm i @ariga/atlas-provider-typeorm
+```
+
+Make sure all your Node dependencies are installed by running:
+```bash
+npm i
+```
+
+### Standalone 
+
+If all of your Typeorm entities exist in a single Node module, 
+you can use the provider directly to load your Typeorm schema into Atlas.
+
+In your project directory, create a new file named `atlas.hcl` with the following contents:
+
+```hcl
+data "external_schema" "typeorm" {
+  program = [
+    "npx",
+    "@ariga/atlas-provider-typeorm",
+    "load",
+    "--path", "./path/to/entities",
+    "--dialect", "mysql", // mariadb | postgres | sqlite | mssql
+  ]
+}
+
+env "typeorm" {
+  src = data.external_schema.typeorm.url
+  dev = "docker://mysql/8/dev"
+  migration {
+    dir = "file://migrations"
+  }
+  format {
+    migrate {
+      diff = "{{ sql . \"  \" }}"
+    }
+  }
+}
+```
+
+### As a library
+
+#### In TS Script 
+
+If you want to use the provider as TS program, you can use the provider as follows:
+
+Create a new file named `load.ts` with the following contents:
+
+```ts
+#!/usr/bin/env ts-node-script
+
+import { loadEntities } from "@ariga/atlas-provider-typeorm/build/load";
+
+// import typeorm entities you want to load
+import { User } from "./entities/User";
+import { Blog } from "./entities/Blog";
+
+loadEntities("mysql", [User, Blog]).then((sql) => {
+  console.log(sql);
+});
+```
+
+
+#### In JS Script 
+
+If you want to use the provider as JS program, you can use the provider as follows:
+
+Create a new file named `load.js` with the following contents:
+
+```js
+#!/usr/bin/env node
+
+const loadEntities = require("@ariga/atlas-provider-typeorm/build/load").loadEntities;
+const EntitySchema = require("typeorm").EntitySchema;
+
+// require typeorm entities you want to load
+const post = new EntitySchema(require("./entities/Post"));
+const category = new EntitySchema(require("./entities/Category"));
+
+loadEntities("mysql", [post, category]).then((sql) => {
+  console.log(sql);
+});
+```
+
+Next, in your project directory, create a new file named `atlas.hcl` with the following contents:
+
+```hcl
+data "external_schema" "typeorm" {
+    program = [
+        "ts-node",
+        "load.ts", // for javascript: "node", "load.js"
+    ]
+}
+
+env "typeorm" {
+    src = data.external_schema.typeorm.url
+    dev = "docker://mysql/8/dev"
+    migration {
+        dir = "file://migrations"
+    }
+    format {
+        migrate {
+            diff = "{{ sql . \"  \" }}"
+        }
+    }
+}
+```
+
+## Usage
+
+Once you have the provider installed, you can use it to apply your Typeorm schema to the database:
+
+
+### Apply
+
+You can use the `atlas schema apply` command to plan and apply a migration of your current Typeorm schema
+to your database. This works by inspecting the target database and comparing it to the
+Typeorm schema and creating a migration plan. Atlas will prompt you to confirm the migration plan
+before applying it to the database.
+
+```bash
+atlas schema apply --env typeorm -u "mysql://root:password@localhost:3306/mydb"
+```
+Where the `-u` flag accepts the [URL](https://atlasgo.io/concepts/url) to the
+target database.
+
+### Diff
+
+Atlas supports a [version migration](https://atlasgo.io/concepts/declarative-vs-versioned#versioned-migrations) 
+workflow, where each change to the database is versioned and recorded in a migration file. You can use the
+`atlas migrate diff` command to automatically generate a migration file that will migrate the database
+from its latest revision to the current Typeorm schema.
+
+```bash
+atlas migrate diff --env typeorm 
+````
+
+## Supported Databases
+
+The provider supports the following databases:
+* MySQL
+* MariaDB
+* PostgreSQL
+* SQLite
+* Microsoft SQL Server
+
+## Issues
+
+Please report any issues or feature requests in the [ariga/atlas](https://github.com/ariga/atlas/issues) repository.
+
+## License
+
+This project is licensed under the [Apache License 2.0](LICENSE).