fix cache issue, add session secret notice

Author: derisen

1-Authentication/1-sign-in/App/utils/cachePlugin.js

@@ -1,5 +1,5 @@
 const fs = require("fs");
-const cachePath = './App/data/cache.json' // replace this string with the path to your valid cache file.
+const cachePath = './data/cache.json' // replace this string with the path to your valid cache file.
 
 /**
  * This implements ICachePlugin for persistent caching. For more information, visit: 

1-Authentication/1-sign-in/README.md

@@ -141,6 +141,9 @@ Open the project in your IDE (like Visual Studio or Visual Studio Code) to confi
 
 > :information_source: For `redirectUri` and `postLogoutRedirectUri`, you can simply enter the path component of the URI instead of the full URI. This may come in handy in deployment scenarios.
 
+1. Open the `App/app.js` file.
+1. Find the string `ENTER_YOUR_SECRET_HERE` and replace it with a secret that will be used when encrypting your app's session using the [express-session](https://www.npmjs.com/package/express-session) package.
+
 ## Running the sample
 
 Locate the root of the sample folder. Then:

1-Authentication/2-sign-in-b2c/App/utils/cachePlugin.js

@@ -1,5 +1,5 @@
 const fs = require("fs");
-const cachePath = './App/data/cache.json' // replace this string with the path to your valid cache file.
+const cachePath = './data/cache.json' // replace this string with the path to your valid cache file.
 
 /**
  * This implements ICachePlugin for persistent caching. For more information, visit: 

1-Authentication/2-sign-in-b2c/README.md

@@ -117,6 +117,9 @@ Open the project in your IDE (like Visual Studio or Visual Studio Code) to confi
 
 > :information_source: For `redirectUri` and `postLogoutRedirectUri`, you can simply enter the path component of the URI instead of the full URI. This may come in handy in deployment scenarios.
 
+1. Open the `App/app.js` file.
+1. Find the string `ENTER_YOUR_SECRET_HERE` and replace it with a secret that will be used when encrypting your app's session using the [express-session](https://www.npmjs.com/package/express-session) package.
+
 ## Running the sample
 
 Locate the root of the sample folder. Then:

2-Authorization/1-call-graph/App/utils/cachePlugin.js

@@ -1,5 +1,5 @@
 const fs = require("fs");
-const cachePath = './App/data/cache.json' // replace this string with the path to your valid cache file.
+const cachePath = './data/cache.json' // replace this string with the path to your valid cache file.
 
 /**
  * This implements ICachePlugin for persistent caching. For more information, visit: 

2-Authorization/1-call-graph/README.md

@@ -155,6 +155,8 @@ Open the project in your IDE (like Visual Studio or Visual Studio Code) to confi
 1. Find the key `redirectUri` and replace the existing value with the Redirect URI for `msal-node-webapp`. (by default `http://localhost:4000/redirect`).
 1. Find the key `postLogoutRedirectUri` and replace the existing value with the base address of `msal-node-webapp` (by default `http://localhost:4000/`).
 
+> :information_source: For `redirectUri` and `postLogoutRedirectUri`, you can simply enter the path component of the URI instead of the full URI. This may come in handy in deployment scenarios.
+
 The rest of the **key-value** pairs are for resources/APIs that you would like to call. They are set as **default**, but you can modify them as you wish:
 
 ```json

3-Deployment/App/utils/cachePlugin.js

@@ -1,5 +1,5 @@
 const fs = require("fs");
-const cachePath = './App/data/cache.json' // replace this string with the path to your valid cache file.
+const cachePath = './data/cache.json' // replace this string with the path to your valid cache file.
 
 /**
  * This implements ICachePlugin for persistent caching. For more information, visit: