add installation instructions to README

README.md

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+# ProxmoxAAS LDAP - Simple REST API for LDAP
+
+ProxmoxAAS LDAP provides a simple API for managing users and groups in a simplified LDAP server. Expected LDAP configuration can be initialized using [open-ldap-setup](https://git.tronnet.net/tronnet/open-ldap-setup). 
+
+## Installation
+
+### Prerequisites
+
+- Initialized LDAP server with the following configuration
+    - Structure
+        - Users: ou=people,...
+            - objectType: inetOrgPerson
+            - At least 1 user which is a member of admin group
+        - Groups: ou=groups,...
+            - objectType: groupOfNames
+            - At least 1 admin group
+    - Permissions:
+        - Admin group should have write access
+        - Users should have write access to own attributes (cn, sn, userPassword)
+        - Enable anonymous binding
+    - Load MemberOf Policy:
+        - olcMemberOfDangling: ignore
+        - olcMemberOfRefInt: TRUE
+        - olcMemberOfGroupOC: groupOfNames
+        - olcMemberOfMemberAD: member
+        - olcMemberOfMemberOfAD: memberOf
+    - Password Policy and TLS are recommended but not required
+
+### Installation
+
+1. Download `proxmoxaas-ldap` binary and `template.config.json` file from [releases](releases)
+2. Rename `template.config.json` to `config.json` and modify:
+    - ldapURL: url to the ldap server ie. `ldap://ldap.domain.net`
+    - baseDN: base DN ie. `dc=domain,dc=net`
+    - sessionSecretKey: random value used to randomize cookie values, replace with any sufficiently large random string
+3. Run the binary