Include LICENSE.meta for installing through git url (#55):

- When installing AAC through git url in the Unity package manager (as opposed .unitypackage and ALCOM), the LICENSE file contained within the Packages/ folder would cause errors because files cannot be written there.
- This commit adds the meta file for that LICENSE file, and removes it and other meta files from the exclusion list.
- Original PR comments:

* include LICENSE.meta

generally all meta files should be included. For immutable packages like package registries (e.g. OpenUPM) this is required, as unity can't write a new meta file into the immutable directory. Therefore any files without a meta file will break. Luckily this is just the LICENSE file, no code. but unity still complains

* also include README.md.meta

there is no readme in the package directory. But if there was, its meta file should definitely not be excluded either.

Packages/dev.hai-vr.animator-as-code.v1/.gitignore

@@ -30,5 +30,3 @@ Assembly-CSharp-Editor.csproj
 cfe-project.sln.DotSettings.user
 VRC.SDKBase.Editor.BuildPipeline.csproj
 VRC.SDKBase.Editor.ShaderStripping.csproj
-LICENSE.meta
-README.md.meta

Packages/dev.hai-vr.animator-as-code.v1/V1/Editor/LICENSE.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: c04d39cdc2e2392a5b51bfa466760178
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: