Docs: Add a Security Guidelines. 🔐

docs/security_guide.md

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+# Security Guide
+
+Here, In this file, You can find the information about security concern that arise with save you password with password manager.
+
+## Warning
+
+Firstly, The password manager is open source project and is currently under active development. So, one is soley responsible for share there information with password manager application.
+
+We as developer, recommended you to wait, for its stable release. before full trusting password manager for having your passwords.
+
+## Consideration
+
+While, save your password with password manager application. you should consider or should have knowledge following things.
+
+- Project is license under MIT License. mean that application is given `as it is,  without any warranty or guarantee` and is open/free available to redistribution or modify. (but you need the copy of original license of the project in it)
+
+- With password manager, your password are as safe as you write it down on pieces of paper or in txt file digitally. mean that, `your information is not specialised protected.`
+
+## Recommendation
+
+Here, are the thing we recommend.
+
+- lock password manager app by using your phone settings. it will make it hard for attackers to see your passwords
+
+- if your lock the app, use different password then the one you have to lock your phone. it make it more safe.
+
+- also, if you don't use the app often it recommended, to hide the app using your phone settings.