Update readme for docker hub

BUILD.md

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+## How to compile bitwarden_rs
+Install `rust nightly`, in Windows the recommended way is through `rustup`.
+
+Install the `openssl` library, in Windows the best option is Microsoft's `vcpkg`,
+on other systems use their respective package managers.
+
+Then run:
+```sh
+cargo run
+# or
+cargo build
+```
+
+## How to install the web-vault locally
+If you're using docker image, you can just update `VAULT_VERSION` variable in Dockerfile and rebuild the image.
+
+Install `node.js` and either `yarn` or `npm` (usually included with node)
+
+Clone the web-vault outside the project:
+```
+git clone https://github.com/bitwarden/web.git web-vault
+```
+
+Modify `web-vault/settings.Production.json` to look like this:
+```json
+{
+  "appSettings": {
+    "apiUri": "/api",
+    "identityUri": "/identity",
+    "iconsUri": "/icons",
+    "stripeKey": "",
+    "braintreeKey": ""
+  }
+}
+```
+
+Then, run the following from the `web-vault` dir:
+```sh
+# With yarn (recommended)
+yarn
+yarn gulp dist:selfHosted
+
+# With npm
+npm install
+npx gulp dist:selfHosted
+```
+
+Finally copy the contents of the `web-vault/dist` folder into the `bitwarden_rs/web-vault` folder.
+
+## How to recreate database schemas
+Install diesel-cli with cargo:
+```sh
+cargo install diesel_cli --no-default-features --features sqlite-bundled # Or use only sqlite to use the system version
+```
+
+Make sure that the correct path to the database is in the `.env` file.
+
+If you want to modify the schemas, create a new migration with:
+```
+diesel migration generate <name>
+```
+
+Modify the *.sql files, making sure that any changes are reverted in the down.sql file.
+
+Apply the migrations and save the generated schemas as follows:
+```
+diesel migration redo
+diesel print-schema > src/db/schema.rs
+```