Update Pre-commit.md (#1293)

Improve docs:
- Add missing steps
- Use the husky built-in attach method instead of manual csproj change.

(I would move Husky.Net to the first option as well, considering it's a
.NET tool and doesn't require Node to be installed, although I haven't
changed the order yet.)

docs/Pre-commit.md

@@ -53,21 +53,12 @@ repos:
 
 From the root of your repository
 ```bash
+cd <Your project root directory>
+dotnet new tool-manifest
 dotnet tool install husky
 dotnet husky install
 ```
 
-Optionally - add this to one of your projects to automate the install for future developers
-```xml
-<!-- set HUSKY to 0 in CI/CD disable this -->
-<Target Name="husky" BeforeTargets="Restore;CollectPackageReferences" Condition="'$(HUSKY)' != 0">
-    <Exec Command="dotnet tool restore"  StandardOutputImportance="Low" StandardErrorImportance="High"/>
-    <Exec Command="dotnet husky install" StandardOutputImportance="Low" StandardErrorImportance="High"
-        <!-- update this to be the root of your solution --> 
-        WorkingDirectory="../../" />
-</Target>
-```
-
 Modify the file at `.husky/task-runner.json`
 ```json
 {
@@ -85,6 +76,12 @@ You can run and test your task with the following command.
 dotnet husky run
 ```
 
+Optionally - add this to one of your projects to automate the installation for future developers
+You can set the HUSKY environment variable to 0 to disable Husky in CI/CD pipelines.
+```bash
+dotnet husky attach <path-to-project-file>
+```
+
 Once you are sure the task is working properly, you can add it as a pre-commit hook.
 ```bash
 dotnet husky add pre-commit -c "dotnet husky run"